{
  "manageEntity": {
    "action": "Save",
    "entityId": "900690593",
    "entityType": "Track",
    "nonce": "0x0fd938e7b87a2476e9ab7fc77d61583ccf7f32ae05aa3a2224ba9b3b8e37a17d",
    "signature": "0x257403d1a4571a626aa0438ba78dfec9fd8d6238be283a4fa7db0c1a09dc1eac6b87198ce47755996449d25043131e1661836dc4cb186275912279d4615245001c",
    "signer": "0x0b901AE3Eb7b439095858D82Ff194CfeD0Fd3396",
    "userId": "167557"
  }
}