{
  "manageEntity": {
    "action": "Save",
    "entityId": "612912476",
    "entityType": "Track",
    "nonce": "0xc617743265cd9f31aea8c2b6c488bd8013a3cc87f691b457c1099bab5c8673e0",
    "signature": "0x86e1c316b8e43268c485beeff1bd3afe333f8b73792c276afcbcab494316ed4255ff86903ff1e4d31334f0f1b239ed9406661873c4e8da519ce624924e8df2671c",
    "signer": "0x2B171214e998033E806F72301307B2160CD94DdB",
    "userId": "489165782"
  }
}