{
  "manageEntity": {
    "action": "Save",
    "entityId": "902152400",
    "entityType": "Track",
    "nonce": "0x6eac4b0578f90f833e3e19a743c91557c32cdc99c312634717dcc3c5c70022da",
    "signature": "0x628a79bec97a3f9c55d3db9c12a49ee1fa13f2ccbaa3b85e56378a2ce68ce82c2fe09163b1ba6021c7b23be8d48fe4920ac5da937a911f66bb06d068c866738f1c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}