{
  "manageEntity": {
    "action": "Save",
    "entityId": "840434213",
    "entityType": "Track",
    "nonce": "0x90a65b168d201ed7ba7092af0b3a1e7152df03236cf08cb6a1b8231c90b4d9ea",
    "signature": "0x99dc31092fdf6a93ae8f8411456aeb38008aa9fea24fff2b4d66b189609e929a3d4b5bac6b3e60ae0fe0ad02ad9eb9fdfd6749b8b2bab9033a7577ac43273e091c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}