{
  "manageEntity": {
    "action": "Save",
    "entityId": "91703082",
    "entityType": "Track",
    "nonce": "0x972a96257fb161df0ca34b90947c4ea7cd23b65af11a0d2c2421f132af55fec0",
    "signature": "0xc999018a524807b65845aef2b50304317a7fd07f5959deac1482946e14dbaa114dd1c16cefb243b63da9235c2e3565e6380559a8abcb036b4a1d71f8390b5c021b",
    "signer": "0x37C656432bDD87630C13F60036e9857B5ee36154",
    "userId": "288167767"
  }
}