{
  "manageEntity": {
    "action": "Save",
    "entityId": "949539495",
    "entityType": "Track",
    "nonce": "0x3221670ae250cdaa50c7630a64f33d4edd8482aba8f3de7315e9bd3fe8d0beb9",
    "signature": "0xd951a0d9f240860ac5a0c0be48842953e84c7c1b46db8f16591cd2e3cf1fe14d44348fd3ab4cdcdb0bc8278edef75289dabc70957fcdd61121a5e243284e2abf1c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}