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 0x745d346233c6d74efe9d1e1ca05f1cf80ced9aba8e36ae9969438267b8cc7195. 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/4a6d680f-41e5-47b6-8366-030175966452.json and https://artists.proofprofile.net/proofs/artist/4a6d680f-41e5-47b6-8366-030175966452.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 0x844e27bfc246f45ae25237a556c59d9d651bf254b6d69fa8f2ea030e17caece4. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/MXF550701333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x039814f33960019d945e73cc8478d9def36afcc58665d10c4c1e2ccf7b4e5a35. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/USJTQ2018267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdb67c5413d76ed23cc81dd9b478dacdf01587b1171804107619a84f33d482f1. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/USJTQ2018271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6fe8afbcf195c62b96d2648374897f9df327d8ec8027cf6887145e5eca3a5df. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/USJTQ2018273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4525cbb841424bac9a1f627e13afef61119f0c2a3cf3b11db91fb35338f01ba0. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/USJTQ2018279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b511859f3009fa34752318862f8bfb6abffc80fbd24aa6301862df4ad89971e. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/MX3192103306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e16e7c9dcfc4bb56b663691e720c4c908273b4bc5b46852cc9f41523aa070c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/MX3192103308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84bf8b208b6df875e2f87ad11e0a434a8d40f36e407f8aa4c9c272222a3fa616. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/MX3192103311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1d26df3025026ffec6b2270a3f8b43c5d870b877b03b44cc2b9f4282bda9065. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/MX3192103315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55da40417c1fdbb28c6c43dfc0fbade0cc3d74b0df3224c908c255eafeecb24f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/MXF550703718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9582e80793b735569464497ce900a3299324ab6589f245081cf53791d134a3e1. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/MXF550703712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27be0bf500bbc67a62d3673b5f1d657e68a71bfa1ed2cbda5291c44299c69e9f. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ8B2500415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x844e27bfc246f45ae25237a556c59d9d651bf254b6d69fa8f2ea030e17caece4. 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/MXF550701333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e3b73811a61dcda7f7708503b8c5df4bad8f1d2b11b4dc83dc327ea5f82d838. 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/MXF550701336.