{
  "manageEntity": {
    "action": "Save",
    "entityId": "454530622",
    "entityType": "Track",
    "nonce": "0x39f183ac6af0f2e5a0b805c0cec7d067f5d85ce037f1056209315d277fd5372d",
    "signature": "0x259c0059146b606eac66817ffc0ca48d5c2e9b6f78dcf69592f81836610fd2346a202dfde196597bdfcb779d585fa836cda2ff63c9af1fe86968dd53e658a0571c",
    "signer": "0xe25AE96B8dB8bd5CF1f8cD812990b5B1a48Be532",
    "userId": "138130947"
  }
}