{
  "manageEntity": {
    "action": "Save",
    "entityId": "507777617",
    "entityType": "Track",
    "nonce": "0xc043de05fdd639fc375ac506631bce157f78f1d0389746bfff52bd363b41e16c",
    "signature": "0x7d994658c995209bded6cd1a8534e01852cc7b835716d087dd9d6e3a27eb2e0c16cc677ae06fbd068907ef72df4e280b558999116beadf67bcdd49326d2f05591b",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}