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 0x7d8b74ceb3e2815a25d3f4020ae51e741015efcc9d4f27d00719eaca8a934ed0. 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/29961867-5e40-4e67-8df5-f65dd627f222.json and https://artists.proofprofile.net/proofs/artist/29961867-5e40-4e67-8df5-f65dd627f222.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 0x575089a6638571eb665a87ef0862e999e347a4d14103e4fb42c15b8a482d360a. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/QZNJW2321558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6ef165d221815f598dabad4d6754c6e3d504d7daac4b5989ecfadc3a44abcfb. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZGLM2384284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc204199fcf0000ec7315f657fe94ad055f2963259357a33a1ec4469008f7a229. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/QZHZ62167541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f20b885ee58db56b4313f7bd4bdbf92fa05eee47e08c34b7c9ddc1ae6f5e4d. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZHZ52129215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60688e4a7e26c19759086a32ceffa23a39485e27f0c58444e9e31f3c6ec46cb5. 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/QZDA71901165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee22961cc6deb60d4ac06f7f422712532aad3186a5400b6727a18335532e011a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNJW2022173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86ae9578c71b1399de97c829762149b96f2799ff55404d438f8b119c395d4a7e. 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/QZK6F2057065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3309833f9c44025b8576a6feadcf090d7752487b9391ab778f33c29ef063b39. 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/QZK6L2006328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1800c0ce15ed4189da3b8d9aff85fa9ec5c1b76a78d30aba02455b6fa66266b3. 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/QZHNB2083329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b0d62ef4ba9a861289b1e4e856e148192109023cebb6a604653d0546bdc3968. 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/QZFZ22083910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a95cd15843c67661814269433a3e469619c7ec80fa452bd021b3a679ab942a6. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/QZK6N1956921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95bbbe7f97ab6c57261aed0bfa10a58694e3f432b3b686db611fe25558847d75. 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/QZFYW2066481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4b526a622bbfe2d255c5b1d4ebf2355cea1f4551c0d2ebf650614ff765acf7b. 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/QZHN91986949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bc3284a015242b4c9ad34b9dd453f47ad6b72c9578c85fa125bc9a314001270. 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/QZFZ41981802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55ff2cd2d38a0017be77f33541f038bb6904a0f7569b4036b090cc5a7f88f608. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/QZFYZ1916826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x635ff6c914c3a6c65a5d0b413f49531d2026403b659ba81501a1c7fa435635f3. 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/QZDA41940992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7489cead45d747a690e98695c571da88e2303693c48239cb0f849a1972095a7. 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/QZ8LD1959924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af051c5e5dd413d4ede7c0f0fd3a2eea93664735369945d9573cb35a6c17143. 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/ARY4P1800748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cae6aa0225f2c9d34ddba962bf4610b9c7413fc484111926d8bbb11887971b5. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/QZDA61814268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed9e4481a921e5530f68767ad543e5921a530d0379d6b21001b25078d5230e39. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QZDA41881580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a257f4a8eadb5c63a7ac5a61a6e6a190fa71e3251f6c9db02a57d8c107b0af0. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/TCADQ1855188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4593e828f3297f60c627505be6a08343c924f2b9b702930e20d978a91e02a95b. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/QZBRF1877330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdab64e72607d10c432287fac88a28a221dd1e5446131359fcd3f3daa8fd4ad45. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/UYB282310206.