{
  "manageEntity": {
    "action": "Save",
    "entityId": "738246",
    "entityType": "Track",
    "nonce": "0x8ee8842b1d758f3041a1fcc2a18c69d8d2ee5b113a460d083013f66a36dbb86c",
    "signature": "0xff624393003a9b2620e63c250327892350d723082598d75e71ce743e176d25d92d149cc41e135d7297597d9d351b2fb78ac47f144b46205e1a7dd2b0956555f81b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}