{
  "manageEntity": {
    "action": "Save",
    "entityId": "1448278444",
    "entityType": "Track",
    "nonce": "0xc87baee4971326b2745ce12844e822fe0e4873f8517a337868059fc2ceed3d0a",
    "signature": "0x4ec8d4cef36c9e3a9e6c04de22f955219f8ee724b4232b2cdc5f32eec86ae5e069e9228ad4b504c73d4330581e5f94e2e228424310acf767f1a20efe3f2e52ec1b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}