João Batista Coelho (born 21 September 1992), mostly known by his stage name Slow J, is a Portuguese rapper, record producer and singer-songwriter. Discography Albums Title Details Peak chart p
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b5f7a04f4c3fb1b22d8032d0554734af4d5dcb48cb216bdd6f59afab7668828. Chain 2 (Bitcoin): anchored in block 954039 (2026-06-17T03:00:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3e607780-ee79-4253-9c6e-2e7a1f477aba.json and https://artists.proofprofile.net/proofs/artist/3e607780-ee79-4253-9c6e-2e7a1f477aba.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).