{
  "manageEntity": {
    "action": "Save",
    "entityId": "1255399633",
    "entityType": "Track",
    "nonce": "0x054ddf058528d7d558ce9c9d2d0ec54cc2cda4948c510c01779739afbce68350",
    "signature": "0xc247bc020a61c3115b24667db261dbd1f5573fe2628f26edfa294144ab48d2192be64609cc8104fff38527871b4baf894ec73cc03408d00b09b64d312e0b24ce1c",
    "signer": "0x13f8ca0832087662A9bA298e1F708853B8615826",
    "userId": "990836999"
  }
}