{
  "manageEntity": {
    "action": "Save",
    "entityId": "1876769596",
    "entityType": "Track",
    "nonce": "0x29ec0a239c17db45f573e83a80dd60b31ceef8c22cbf5dc6e6e61f493360ac40",
    "signature": "0x08390a79331ebc9d33c9c669ff0a2023f5666efbda700f546172150187207a10349424e999777ca5969e999b748c308e562178e660f7ffdca84744c810607c0e1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}