{
  "manageEntity": {
    "action": "Save",
    "entityId": "74813974",
    "entityType": "Track",
    "nonce": "0x030098770f8df5721d25dc771e1aee7cf4764d428711ba3eee8087a527740ddd",
    "signature": "0x9c11bec5c81b074869f90273ca23c4074f3692f0c5574754c5095e71e76ac27a47bfc215cf7f11766f0ae8a7cc257e0cddd9bc78503439c088f042370657f2511c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}