{
  "manageEntity": {
    "action": "Save",
    "entityId": "907759509",
    "entityType": "Track",
    "nonce": "0x365aca2b8b01458e3a9e3d5eeecc56718e1ff3bc063a71df5a48cc285314ac0b",
    "signature": "0x2879487ca888d670b242aecbc58cd4416e7a5f3bb6646e50c1d3c14d39e484575a3fa100adabfd99cccf3ec5a5d15cc7b34bcb89cd4ec86ab7efa870b30bdd5b1b",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}