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 0xc43ac63f4c72c2f14ecf96177b9fda584a4191d246671e600f1664ebb1706188. 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/6f75c0f1-d226-483a-904d-3d425cdf49e1.json and https://artists.proofprofile.net/proofs/artist/6f75c0f1-d226-483a-904d-3d425cdf49e1.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 0x713db178ac21a0dffeee9db38de03e032eb9fc891ec054d80c6e274c3bd5b82b. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZ8LD1736554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87e604dde05d7ac6a50aabef07f79ad2ac020d9eace109536f3e1769b8d6c3a1. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZAPG1817990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d9909dfbaed0c01f1bfc8207e6dd17feb6906d53de8b1b3d556ea5a28823576. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZDA81896987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14ca01ab7a43a0f2c104a5dcba88c63ad8190de1f6654752dbe82f502366d5d7. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZHN41949986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70a96239fb27ca71c0fc220e44cf5cb3aebf88f3b9094135fe07025728de71b3. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QZES82209607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf037b1759ea0566d515f4983598b95c55154aa5bf13cbb24e79057b59fafbee2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNWQ2251336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38212a7f4e96edef06aee1e3afb234b1ebcd34e89ff6af061edf33a5224fefbc. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZES52353165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d6d7a9c062ea657cc345db12da75b1ebb0498265df891653d2c2bbf4fa49fa6. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZHNA2359016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fce22634379196a1c643988188b7f766d6c1f7db368bfd5649924e599325a14. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZNWZ2327638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaef84a8f41b72a61c62af100dc5165c521d41260737b2cd3784a844733a0bc57. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/GBPS85402693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa15a9ea30da35358823ae1a4f5675b7f6d8813b73bd81abd3a310b654289b4fc. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/GX89G2434965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1b027788a4d76aaaf0c867a9118393e401824f68f8e09bf84fc795ef01dd412. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHN82410405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30d84b5e170e188454d9bdeaba672662fd2db374a9e583b387968595e89535f0. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZK6P2471724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71bbf2255ca8c7ef36159c6ba93426c902c8a9b32c15b44adc7449f67f366f67. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZK6F2408130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9aceb69a995f92ab4b691f04a14d245cb8150e3fa4e6e0f26960ce21cb75392. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GX38U2449671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bbeee2b9b76409e33de404b9f2aa5e922727b7df3c524bbd5a886cbb3a480b4. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZZ762434579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x567c759ddff60086718f946a789415eba978e88ddb31bbb5fd80d91fa733d22c. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZZ7M2518187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x665511741b87a9fc04e35309881680384ab9f2135d5539324753dcba79ab82c9. 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/GX8LE2383414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff4b515b6ff875247e09f5e2dfcf7d2fce232d5b5aecfe5776ecc0a908a782ce. 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/QZES62414334.