{
  "manageEntity": {
    "action": "Save",
    "entityId": "461594705",
    "entityType": "Track",
    "nonce": "0x570bdb64453c387f7c3779341c88ba1937dc93587a9e20d7448ee9b5ea2223ee",
    "signature": "0xd4bb3d5aaa42c9b33e9eeaddb218fdb1efaee08e9368a9fe7ef3f0ba6f9d94e674499230e2bdd99c246ce45b2858a0e48f4c01ba56c55de79ef68672785c96e61c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}