{
  "manageEntity": {
    "action": "Save",
    "entityId": "522428",
    "entityType": "Track",
    "nonce": "0x443fbd75c6b73f4e875779d26929723b7447ac1238203e6f46c9d46b60b9d695",
    "signature": "0x9b03d234ca2227b75641fc69466d76988fb3f49b822c3f9a2f01329b03eccfcb23c51043a73bd34eed4e7d36521c9210f9796d7371873ce74afa063805c8d07a1c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}