{
  "manageEntity": {
    "action": "Save",
    "entityId": "545540",
    "entityType": "Track",
    "nonce": "0x221c2ea54b9c658e2d33fc4bed24c123a6e9f93fcdc99f962089d87d4e44d6da",
    "signature": "0xaba6913ec71679a072a9b1e0260fe0c719f02928758dffb886da3ed6ba3cdc1042f467762443058553ef33857e91ca64c5e2556bb78e6ee703d8281e9715f3fe1c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}