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 0xf459d8284f55308a5d0c5263629d9d7667509c69225cf9486c20f169c1e3b4be. 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/bc0532d6-70b6-450f-b58c-c8bd2c170cc2.json and https://artists.proofprofile.net/proofs/artist/bc0532d6-70b6-450f-b58c-c8bd2c170cc2.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 0xfd68995771ec8971d3f3f9e994688debbf931574b171ab45b989722d7f60775f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ES16E1900086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3da85dbd0aefe90405ad54956645e046a559daaf311eb5e41696721d21e85ed1. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/ES16E1900082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ba54cd6f87d998938ca550684e13ae783841768b4951ef56237ab5e8f5e4479. Chain 2 (Bitcoin): anchored in block 958122 (2026-07-15T08:02:29Z), 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/ES16E1900083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x010c91cd4644410d32bd2499e27759416caffdf40465b65e08ef805c8593460b. 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/ES16E1900085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cd48e45cc0e9ce2af7dea7853d0a5e676bca858944555cad8192719d59d90c4. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/ES16E1900102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc666cdf821a1e9bd7f65479f4005fe6ccbb98928def203d6acfa32f29387e3c9. Chain 2 (Bitcoin): anchored in block 958493 (2026-07-18T04:34:53Z), 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/ES16E2000128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x652694ee6ee3ff64df855e1e98be41328bc76a016e81c15823c66b238af98b6a. 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/ES16E2200423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a31ce1ef5bf05ee2a1f96ca0b5e5511ac6ae8ac31614cd80c397d9d979d7f90. 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/ES16E2300553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc772b53fa974158cfbdd2894df658c5727cba0317b34fb3bef097f0d0d2e0a39. 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/ES16E2300574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x637c5d6032088062e49cb7c0db64eda588552af33c5da100737943ee84cc249b. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/ES16E2300575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b5da96a7259fc92e4516c2a6d0bd02c952b44650b164207072cac9f6db09473. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/ES16E2300573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd47f41d21785fcc369e001aa9d56be3a9049f317ac2a5cdbd498c1c759303a6. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/ES16E2300576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a31ce1ef5bf05ee2a1f96ca0b5e5511ac6ae8ac31614cd80c397d9d979d7f90. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/ES16E2300553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09f9e065731629ec12e0a6f85f03548258b5352d3005c9a6c50e8351c48406b7. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/ES16E2200476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d567323c133bcab628a98e0622c319e5b164f9f8326cc8788166bbf183292a6. 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/ES16E2300577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e9802ffd45a2745f5098c1b9084e3b32e80f347d65dd436fa51dde1f9fd1207. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/ES16E2300578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c0740136e68819230b1d8bcca2369258148bbcae1f786715dd19177e255269a. Chain 2 (Bitcoin): anchored in block 960210 (2026-07-30T05:21:45Z), 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/ES8022300102.