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 0x076b389bcd882884a9fb32920e08cb6961f7d0012e64de9fe4da6d01108b325b. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c224d3f4-d0af-43a6-b5e6-45da8f2361a1.json and https://artists.proofprofile.net/proofs/artist/c224d3f4-d0af-43a6-b5e6-45da8f2361a1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Singet dem Herrn ein neues Lied, BWV 225: Singet dem Herrn ein neues Lied (Chor)
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0xe52b81642cd1ec06ed9cd53de781a9696c9cf0f58093a15a70f358f49589dc16. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ722383601.
Jesu meine Freude, BWV 227: Jesu, meine Freude
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67625a93c35e97b7f892b7e0745dc1b4e7bb166c4ae46b9cc627950661beefec. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ722383604.
Jesu meine Freude, BWV 227: Es ist nun nichts Verdammliches
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x802692ca6182e7c0fdf72b23dfe09f84c9b6f3762a050476f3a600d2bde90141. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ722383605.
Jesu meine Freude, BWV 227: Unter deinem Schirmen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb923447aafdcd7f8985772e444636fee3484e20b5e9f746d64a27766d674a8b3. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ722383606.
Jesu meine Freude, BWV 227: Denn das Gesetz des Geistes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d2bc744f8b7b22e6136beb123c041f59d267811c937c81a995b492abec35daa. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CAJ722383607.