{
  "manageEntity": {
    "action": "Save",
    "entityId": "408952",
    "entityType": "Track",
    "nonce": "0x8df300e0a51c8b7e760031d7f4b9661aae10b8278134521e851807c4bbde6f75",
    "signature": "0xbfc0b360d763ea4d2abe84d37b510d671de651b4943a252aed92f300d356b4213e98c5773ea994a5f70924dd5f9d3e3d352e11f1e667ba1850200526480b40561c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}