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 0x4ed4e54e34842141520eb769e72eebea88060ec459ed79d790ad02dcca2503b2. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b6af82b9-3381-40f2-b2dc-dbfe7b41eeef.json and https://artists.proofprofile.net/proofs/artist/b6af82b9-3381-40f2-b2dc-dbfe7b41eeef.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 0xcf429dc8a5c95293b9d5e14754624060b8d9574f80689193da5718a7cd594f65. 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/TWCT52433814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x510ea50e3abae904a356fb36d087a9525d9246e11fbcd47d392387be2cc94732. 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/TWCT52434963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fbf54e06953a0fa1080bf48f9c480510e8d6280b84d046b040056a65a296939. 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/TWCT52434964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd52134b8b96de2818522aa9c00f080fd474b2836871aba733cc8b66c38473ed. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/TWCT52434965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x151309e015ad323b2ffdb0308342c49b8ca65405336b8fe8a5bc4618e3bb48fc. 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/TWCT52434966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d8aabf6089677db207fae0e50d62ad48dbedbaeedef6c1928e77c9cc5d46803. 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/TWCT52434967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7440784fd85232b8159f86d24026df98b69b046f7addeeff34e418c3d2ef2f6d. 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/TWCT52434968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5806c05e32dfbb1ddb6c58c8e0ce9c260979af2b2b4e6b0074c567550d7493e. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/TWCT52434969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ca11b111c0b6fad9a563b14eeaf180dfd689f1677ac233ea5373d4255e61d95. 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/TWCT52434970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00c59e31e4ecb3f4b44c13c1dda7a57f3d1996d11d0a32e747ca0000cde408d9. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/TWCT52434971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4ae01ba0d5b064f0d1338367d5126239a70a170635478dae525fa8a3320f502. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/TWCT52434469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x059015d7eecbf1db9eb8419e4584869c29644b5ad541f835fce1eefcb9d9cbbb. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/TWCT52434042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x815589da5f34e270a98b9e295a2a9846c669cbbf003dc8e2cc9c15bab2c67074. 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/TWCT52434972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4ae01ba0d5b064f0d1338367d5126239a70a170635478dae525fa8a3320f502. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/TWCT52434469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x059015d7eecbf1db9eb8419e4584869c29644b5ad541f835fce1eefcb9d9cbbb. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TWCT52434042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf429dc8a5c95293b9d5e14754624060b8d9574f80689193da5718a7cd594f65. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/TWCT52433814.