{
  "manageEntity": {
    "action": "Save",
    "entityId": "350537",
    "entityType": "Track",
    "nonce": "0xc4a6a676dfac04da6530690e204392560f6e643ad2a4176865df75a4096815a3",
    "signature": "0xd1e2cf9d80ec6bc0abc2661aa8b0b119f6ae096d742b4ea0728c0ff5e4d4861f008ba70ff9264dea021c89e3b4943db6ee690076428eb7b64e105d0daa6049fd1c",
    "signer": "0xd367754F1CE503c2D28B6793582BC23fD71eE997",
    "userId": "420647095"
  }
}