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 0xc731ca0fb72e5b86a2d771d016105cfb3934f1650cdcec536c70ff98f4e2334e. Chain 2 (Bitcoin): anchored in block 953896 (2026-06-16T06:05:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/10de9908-f162-45b5-b981-b2baddc34c64.json and https://artists.proofprofile.net/proofs/artist/10de9908-f162-45b5-b981-b2baddc34c64.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 0xb9575c12e9ec9a85b6847d8023efe1deb07e0fb53544be7b95a26aa7a60b5331. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/QZES82092180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x616815bb194027004df62d9467c371961351c2dbad32358528be295a5ca3c362. 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/QZNWS2255531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6506219e6629fce9e509d3dd3cf91d7a71148d3078cde3d69609a23a9828b4d. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZK6J2057025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb556422fdb2162d1115fb2a13fc7a9889ab85cb712f21570381ee2fe45d34ec5. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZHN52092240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b57ae891419bed4d47e89a46c783811cf7202e2f03860341190714688f465df. 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/QZMEP2396893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x266445460563ef5706c177871eb5402543f497225999c6f199e41b300d07ee0e. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QZTAS2350146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29ce67db99fbfc0cdff5ea0206ae010f271ac414af17025fe83b81140061f885. 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/QZTAS2350149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15202d5e5d382275d6e799d5bd437a21b3c860f8ca6f61b8a43b63d3270ad009. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZFYY2388631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0a7163c277e4c10e7d2bc4932afe59f8a260a8431cdfaa62363b49c4e6fc9b1. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QZTAS2350150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4ceb9305f39b6ef2437fbe080e0046cd9ee5bc59ecfa8bb0f6b35ed6b1aeaad. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QZNWT2016602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b57ae891419bed4d47e89a46c783811cf7202e2f03860341190714688f465df. 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/QZMEP2396893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b475ff40632e5b2157c33a1bd25bd360fd21446d8c9312795fba7295c5878be. 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/QZS652392531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x323e9a2d1db4a971320e01e936fdf1bbadc83094d0ce7ea51424c411ef6a78a1. 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/QZES92255773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b71fbbfdbec94db78cfc2624f5eb073f09fbdbf5b61263545607eb4152c10cb. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/TCAHZ2465028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a3bffca75816ca55ba7ae1c26634427b3a4e7ab2ac7560ac4354e514c921751. 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/QZK6G2513701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x882d78f5e3184465f8620e7d0120ad8e84cf14b77f95d2152a8de4872861e0b1. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZHN62557179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2b2fa11b3fd724678c2983a82531fc7dc796b2cb2bfb6201bd75d73010961e4. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QT3FE2508629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaf214459e80516c174e72d663a10573b21c4a6788dfc2b0ff4637df190c0f74. 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/QZZ7P2574077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2ab3dbd5ec970ffe8b390084056044eb637fc14ba7e0d8c2b4cc42867f74942. 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/QZZ7P2572197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9028dd03c273f39ebd3ac4827a35d935187f947b14467889ef79fa73064fa3f7. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZWFT2561967.