The 3 Sounds (also known as The Three Sounds) was an American jazz piano trio that formed in 1956 and disbanded in 1973. The band formed in Benton Harbor, Michigan, United States, as the Four Sounds.
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf257009b12efa839653000b3239a972e1608a2491a3cf1f2f47baa8cd977d8b3. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/67af2489-2b62-42c0-844f-3be402a2ab63.json and https://artists.proofprofile.net/proofs/artist/67af2489-2b62-42c0-844f-3be402a2ab63.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Four Classic Albums (The 3 Sounds / Feelin' Good / Moods / Ld+3)