{
  "manageEntity": {
    "action": "Save",
    "entityId": "1778499572",
    "entityType": "Track",
    "nonce": "0x792214a282bb484c67c053fb62e2e7f78fc445daf8603a686b41bac79d745c19",
    "signature": "0xed88a1de9d4cd415b44c059e35df0d8e46bb923819111871b6e2ddcd4be4233c7b539389255ce1472a98b9fd740818c0ec2db101a0c67575bc8a936248f7de1e1c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}