{
  "manageEntity": {
    "action": "Save",
    "entityId": "770612142",
    "entityType": "Track",
    "nonce": "0x2ef945ee02fac934fd7f51478f5b863ecff11fee0b65ad772f387a66dea82609",
    "signature": "0x8219361ade7232f82c6c64db8e4026d8cf9f76e045485b5e1aefa0fd91ecb767708e1a08ef9518e3eeefba06ab2b6ae8e0e718ff79affac6f017aaf6bd07d0951c",
    "signer": "0xcf1f3CF82aA41361e21a8d4ed015Ea3A1aDd1C8b",
    "userId": "238180"
  }
}