{
  "manageEntity": {
    "action": "Save",
    "entityId": "637450452",
    "entityType": "Track",
    "nonce": "0xd580f5dbb3f7758ea23d363c8168d2a1e7af9bba38b072f4192fbbead20928e0",
    "signature": "0x302b65839c3f98bd9e90ac2f2ce5fd3ca835e307f0faf19f3ca0c550dcc6e4e119b56b0b05a561df29cd5a58ea32c8b6d2c468c75323c407e5890f4a6c3c09e31b",
    "signer": "0x7eBAab495a64FAea1f04dc59ff804bf939da7B12",
    "userId": "709077025"
  }
}