{
  "manageEntity": {
    "action": "Save",
    "entityId": "616747931",
    "entityType": "Track",
    "nonce": "0x67cf3383232bcfaaa8625d3f0c19c203901bf1648132baae02ae749580f8b3f1",
    "signature": "0xc57ab6e1c2a3bed557a274057f6b28933f31580d4c7d994f1a14e880cb8867054cae5d8ee9ae94a6e398de2cda2210ce29fd3621ad295e11d072ae836ea9558e1c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}