{
  "manageEntity": {
    "action": "Save",
    "entityId": "754395173",
    "entityType": "Track",
    "nonce": "0x987f924758008936c829db70499dbad3bfc4bf50371417558eb7fa94dd17abe6",
    "signature": "0x498cebeb2742b8175e4ddf603912df0fa08b32c17a1e991df8917497df39768172ff2e15320deab248ee67ed7c48359c23514c2b2786db215245c85fac2c66af1b",
    "signer": "0xc3248519A3a57eF48c6dbf7bD09AFc919eaDAd47",
    "userId": "386348996"
  }
}