{
  "manageEntity": {
    "action": "Save",
    "entityId": "629945776",
    "entityType": "Track",
    "nonce": "0x41db0ed64bafd48bc935a3aa13c4a77c1cbdcc17995c45b79437d832f3abd80d",
    "signature": "0xf4f4c7b0dd302a476fd00e8db5bf82531f30c494bb76f62f8804499cb4cb715a12a1964cf5eef810db6893d6e05c22e0a46fe11d57f80a056c4e5f029473e4041b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}