{
  "manageEntity": {
    "action": "Save",
    "entityId": "778685903",
    "entityType": "Track",
    "nonce": "0x947fedbd673624d7356ba8a329c4bd79afbe5e26ec22454cc566d9ce52ce8b47",
    "signature": "0x213fdeedb0cc3db89937b813d4ee6b9ba91f0d6d5771528b9b3d53d50bc841ab11c8f8a013eff100a60f7e01772bc47e0c068c40f2fb1585db4717e6f167f8041b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}