{
  "manageEntity": {
    "action": "Save",
    "entityId": "87354495",
    "entityType": "Track",
    "nonce": "0x63d76ed04c13b85e23b6f4721e9ff767fb8b2a994f733194df04138af0a5abec",
    "signature": "0x4561104ccc737fa49559ce9f3f637930978cce5c6e22afeafcaa23684f6e1121131dc587df1186e7e6b72463ee898790fc2f2751aa8bb3524543fdd8e5fba7a91c",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}