{
  "manageEntity": {
    "action": "Save",
    "entityId": "349487237",
    "entityType": "Track",
    "nonce": "0x0f200a8f8ec09686bfae45c65a3e9b205728480be96cc611daa55d687cb46846",
    "signature": "0x2b02d3891abe2183867cdb3c9b52e0837dd4eb46cc9350254384d9ab3ba8165924fb1549a7221447b756dccf036c65425bb1e99eba4722a69156032e941d4e491c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}