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 0x9932cbc41336322632fa1bfab3372293ff45ab9edc4552902c9b993f6e5949e0. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/818dced8-818a-4205-aa50-ec3a9ee94d3a.json and https://artists.proofprofile.net/proofs/artist/818dced8-818a-4205-aa50-ec3a9ee94d3a.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 0xfed90a8a1a74ee25342b8029e12eb95e17e1257334f41276d0daaf2bc80a36c3. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/EEBA12400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9ce6ab00a3ab477e2063649fc00df1fa4fcdd08c5c219d0681f116e2f85a7df. 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/EEBA12300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75cb4e103fde49ca38b0d2c328be3a693446b6b7afb5a2919c5a3ddfb7149275. 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/EEBA12300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46ead77151bb8b31ccc360b649dede1693ae83448c77f942a2d3119be65dc7b0. 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/EEBA12200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda19b6a2aeeff573880ceea967fa565d6b628cf54c8488246192f0b9eca0fed9. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/CAHQJ2106944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb87005f8615759f94ff4062325701dec60e68ce9869d30c9c90c1e74eba068fd. 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/EEBA12000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dd739110839fffe59dd261d2a6eeb68cf98e6e048c1f670b180ae4494cf48bb. 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/EEBA11800051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2955f9ddea104d91fdef70658208434d8d43fc7fb64cd723e43d8e56b1b0179. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/EEBA11800050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x817b2ab88c39eb57574d27a07c6993ca52c1c81b9a5952de6d33def3bce27037. 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/CACWV1826960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc373ba427598f64f1518660d7903c8c076800379b62345d83d96050f516317. 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/EEBA10500053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19d19abc92ed9ee7016a19e7df8339e9f709ae34fdde3e2f72f913e0b01b5f8b. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/CACWV1826913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6c667e11be6c9b4a91c555d28956b7616c2c40e81683274552b9019b819b745. Chain 2 (Bitcoin): anchored in block 960161 (2026-07-29T22:51:26Z), 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/EEBA10500047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d753c9f8d15e8295ff95ea3488e939541063fc1d5a9f056c50527de261662d. 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/EEBA10300097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c8c522ef3cdca179e364e46ca0f0ba92ee1d2474e84fdfab92d67218c72dbce. 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/EEBA10300095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e94f9eccb99f92f0c5a2d6c1540dca1291043e24c4acb48c889923132bf083c. Chain 2 (Bitcoin): anchored in block 957249 (2026-07-09T02:31:37Z), 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/EEBA10300093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9faabc91954b6ba93caf77abf2900801fc8548db893e2e7d33b53ba157434ac. 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/EEBA10300087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54a36ef972bf3b76a8936cb15215397ae990ed25f29fc5691834c55625e75820. 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/EEBA10300084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd33bb97055bf265f6975084245cf615ebb23709ad184fd29edcd9101006ca25e. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/EEBA10300064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa90db6656f6195046fcd6a37a1e249eca8c14ab29b72b016b083bb0b1c5ad066. 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/EEBA10300061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05fb94a8a3a873d5589a3820889acda2b9b72b39cacefacc4086324cd43d7bdd. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/EEBA10300063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b79493313400c3b5006d3a50c8faaf8b6398d7936130c40159c0980b88b7902. 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/EEBA10300058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb99e850530a821d9327a39ddbbffcd9cacb1ad30f60896839447f831a0f408e. 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/EEBA10300057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19b1040c2d34bdf6a3e4a1a103e6fd0010c0138afa9fcd0b910e0b49bd088ab7. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/EEBA10300049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eeeee18af1d2be867a6227b6a825c0c7a76f246750b174e0419b3ec149f7896. Chain 2 (Bitcoin): anchored in block 960355 (2026-07-31T05:49:18Z), 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/EEBA10300051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e62ceb6eccb4e52e53be902c1c306e4e70253cf4c4b9d2a482aa1dfd8d7cf7d. 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/EEBA10300050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc34f805f67a26d8c6790c0572200d22b258681ebabd7a7bb7f8c43dca55482fb. 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/EEBA10300102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef865ea3791e58f7fcf1773f2e1f29cded2a1ed1cd94c79e55ba4dda903c1db8. 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/CACWV1846390.