{
  "manageEntity": {
    "action": "Save",
    "entityId": "221862",
    "entityType": "Track",
    "nonce": "0xed5e08d87113745d124f01bda38f1f1ebe3b10faf52cc8aed3df61518e8d54a9",
    "signature": "0xb554cab34bf48f3970b3ed227931ea0f0d88dda5bad0e553cd759d84c543908a374d44aa8524cc28e8d6be56603ab4d86401c2160581eca168ed27144c07d6981b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}