{
  "manageEntity": {
    "action": "Save",
    "entityId": "719749",
    "entityType": "Track",
    "nonce": "0x31a656b3203f83b97c287db40a803a06f365228a864013457ef2ab21e436ce00",
    "signature": "0xaa2313c0887bd2031f7e1e750d93fdda777850a2fc6cd538f64b9ac0d613088c0b7fb8681ff1e23de2ab76f3a9b22e9e2033bf6e300a90b856e5c441f45c5f941c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}