{
  "manageEntity": {
    "action": "Save",
    "entityId": "745087813",
    "entityType": "Track",
    "nonce": "0x454e3a4b32c2a905c0acb1f79fcace2c2ebdb66dafaf7739db23a7890cd09b1a",
    "signature": "0x660e6991acfd2f2ff5a2d9c410f042d4880c228c04d2484abcb97544a8b092716cc094b1c88953515c46308a95f6d8cba776abdea1ed0f4344a224357fe91f1d1c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}