{
  "manageEntity": {
    "action": "Save",
    "entityId": "1253996500",
    "entityType": "Track",
    "nonce": "0xb5abab5cdda09d2d5148817e7aed5c5bc0118a07339a8f1e133c68a86b235bb1",
    "signature": "0x71efe3da4b3af81f8ac3dd7cedb6df2e75e4ca622b3c9d310a912f50f62fda94723fede4093f15d0f1a8441dae2a4cbd8ee6188b0be3eca11a2737e74b6e68a01c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}