{
  "manageEntity": {
    "action": "Save",
    "entityId": "542396939",
    "entityType": "Track",
    "nonce": "0x3147b4db8d81d1097848d84510af4ee8ccd7540b96a7d403318bb0d63e7b7d01",
    "signature": "0x1120e5d431a3b07e3390ad39a3f07b2da25a2eff942e6e77624012505bdd670476aabea2ee759df84d079827e2a4dd43518a0083c7b24f85e1c9e6b5b72a793e1c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}