{
  "manageEntity": {
    "action": "Save",
    "entityId": "513854457",
    "entityType": "Track",
    "nonce": "0xe0e2e6939327b88fb09405c5fcc45cdb1566bbcb2690ec8090a9956fd89defa7",
    "signature": "0x993a2f2b380d826ea3db6d1c7d84b3a2efe34aff13eb56df2b223408f4a0789b3ad0d8e6e0566499977f9c94eaef4b3b10520c69525f3c0b57f8cecd3eccd7051c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}