{
  "manageEntity": {
    "action": "Save",
    "entityId": "1646494521",
    "entityType": "Track",
    "nonce": "0xae752ae793b9a6b2f417b292c7b1ba95af60a67a5f4cc4c00b3df5077223d1c0",
    "signature": "0xe8aad5994003754f145871e0975fbefd7f0aa035326cbca1eda67ff0eeebc22e6a7b2d77d62e95ed08418f96e8f37cfea051d97d20dedcb21ea1c340459d40cd1c",
    "signer": "0x3D4d8a781454E2338c482dE697d6DE1ACc7D9031",
    "userId": "599751364"
  }
}