{
  "manageEntity": {
    "action": "Save",
    "entityId": "725684330",
    "entityType": "Track",
    "nonce": "0xa72efe452f87a073f6421bf2f4370501d89f95d5cb6a8f8b7eda4aef8cf96533",
    "signature": "0x7e434501d0e610e7ae9e83561fd4f0d59808d00510fd485c547a01cd33ea3d3a296e325a82b52253d5d582ba8c46469cf0878985408d8cbb43af50a9d3546ba31c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}