{
  "manageEntity": {
    "action": "Save",
    "entityId": "1778370545",
    "entityType": "Track",
    "nonce": "0x189f1393cd92800b0129f5c17885943999106c6b0131e309b391f31c5d6525c5",
    "signature": "0x98e3bc9a54c9878d678369bed4e93cd257427c3610504d8108ee7a026a51e3f94e4e3b8fb0d8060eeb512acb59daf3ef10025309a974d91187a1254b98abc0211c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}