{
  "manageEntity": {
    "action": "Save",
    "entityId": "884086569",
    "entityType": "Track",
    "nonce": "0x4fdcbf576807a4a4d171ee9722db4b1344cc3b6286ce66f8d76a766218019f48",
    "signature": "0xc4872b8ff686bcef6245464e91c4b51c57dfae2f3eadb32014304d05bde9e09463688129b7b9276d21b2a2ccd10c2687fa3026759ba7535be0cb4a5df194f9d01b",
    "signer": "0xb6B208a8f79b1D88d245afa5aDB0a40d38cd6DD1",
    "userId": "528688046"
  }
}