{
  "manageEntity": {
    "action": "Save",
    "entityId": "250612",
    "entityType": "Track",
    "nonce": "0x9a5ccadb9f514c04c6f3a067524cbbc16f01adea54a1e0e763d26075fde9fb46",
    "signature": "0x95a4f65436b5bd6e4dda9a440995c1bbbd4e554760d7162eaced6576de366ecb292a09eaf496646039c816017eae522cdcce3dfdd983aaaa343d40432021d5171b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}