{
  "manageEntity": {
    "action": "Save",
    "entityId": "616098",
    "entityType": "Track",
    "nonce": "0xd5c147b3d524afbacdcfabae5723626810a54d6e250d9d32e52e08c1af710e20",
    "signature": "0x0ab66efd3d644b28734dabb0016d6441a027f3c039ce93b66856d476a563bf82741a1bd79aa7562fb75898a05768bc8701edfa843a0f394828f1b1fbfc2db5f11c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}