{
  "manageEntity": {
    "action": "Save",
    "entityId": "377539399",
    "entityType": "Track",
    "nonce": "0xf8ef584a8ffbd4b24fa9d508480c127cc2db20df4ca5a97d5d150f39a0c8099b",
    "signature": "0x362040dbabd603debcfceb9c8ef58094dfa26c6bc2bdfb6a4f0a140f5632548724652262486e0e8dc40a5f1155d10ec074b846916a554dab1424f7f2d444cb361b",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}