{
  "manageEntity": {
    "action": "Save",
    "entityId": "542115954",
    "entityType": "Track",
    "nonce": "0x07e13f4e5d48eed75cfcc6b111d3d5c8241d16f27fce9619930f4393e1985cbc",
    "signature": "0x7ddb09f196f53191433de16555a0d66ef383f2ea167629313675781634cc348b322360a285ee1ca0db71a9c99bd6b68100eb28069268bd1ff49d144a184bcb041c",
    "signer": "0x4D8EDeF47b57f98c89BDFf851267B0327BE4cD05",
    "userId": "5307724"
  }
}