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 0x510a2660eb1bad1ada36f3ae579d1ec0896ba61cbb2e381589d710524a4c01c2. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/398e14f0-a9c3-4483-ad39-e932147bf2ed.json and https://artists.proofprofile.net/proofs/artist/398e14f0-a9c3-4483-ad39-e932147bf2ed.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xc8cc0f0869d7a65a9b9c3a83cb29c32e12eda9b723f9cab5e5df606c3b32ee80. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZDQH2385620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf009bc5f01e3d415943a00ba29051a605a0da31776ed30e39d9df91c81145dd. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZDQH2270995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x823c36734d41fb61ef159b9df7b6eefa5b1c1942c26f71448f72b392b0e14b72. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZDQH2256485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x435a949eafa9669b4c1935a20b2977b46f43b8b1d9e4aec7df63d2e3749fb54f. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZDQH2256486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3ec19d8651fbb67aa8f17def9067a071f082a55349772d9a2d8587ae6788857. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZDQH2258233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b6c9292dad2d745ce0b8296292f83884b7a3449d39087e88c5a857dbc85336. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/US3DF1959048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6ad6af2ff1d02a226bbebd15580f93447d91396eff7e13d1d6576584b203880. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZDQH2421686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94a2571c423ae951e5a3e30c187058def63e52f587702d1947794ec529a6d8b4. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZ9QQ2400278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef37507733f4fc5f97d0d7cde614f80dd5f6c29c92387e3fe12765c88af9c215. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZDQH2412286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x435a949eafa9669b4c1935a20b2977b46f43b8b1d9e4aec7df63d2e3749fb54f. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZDQH2256486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26bb758e12005c2e037c654981a3118065661c39db8ac79325ee079a5ef4a8ab. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USUM72113754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33603817637e7b8039a21975a2f752fcb1347da344dc2d809318e1168b219dcc. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USANG2195889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f534ca10ec56868347f1f832b8414c18738dc83f86c2f69173a7f7ee19bda77. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/US3DF2000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa155251c05c6dae1f5a5a03470e3e8761835018f5381f62ac64e7e941e98fb42. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USUM72012565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x058d35377f879d093320c183966091e843506ac8058ab028ae6a337fe8675317. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USANG2009403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfbe6cfd8e112f225cd88b67582165ad285d0cdd3c099c9e1c6c8e456d7ffcd4. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/US3DF1722028.