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 0xe1df4b732cafc812606095517ffa6c94708b760c59a123d048eb39cc57930417. Chain 2 (Bitcoin): anchored in block 953605 (2026-06-14T07:39:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/122f2bc7-6244-4cf7-b197-2da744cb5273.json and https://artists.proofprofile.net/proofs/artist/122f2bc7-6244-4cf7-b197-2da744cb5273.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 0x1e99750c6bde527bab7924de2fc1e664615afae04bfc11b42ca62cf16bf31b2f. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/EEHU32000334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfba03383cec12dd3e934dd09cc0898aa80282656a93e3a20667b890243e1a0b9. 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/TR0532013361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9db410c7b87d02edc9c8e6b5b8dd28f38f22e914a3b3c61c08049561c0651528. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/TR0341000350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7ccc091f0a7a0f280120d57a24b9ac88e2dd9a79f65845a7000e4bcdc3d74c8. 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/TR0341000352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8da5a73d2b27794becc63a000f22187015952797c7e131dbd75a52506337a4cc. 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/TR0341000343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c278e0238c05d09a1ef2f6454335c48dde6415b7842a1056d0cab449993d46e. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/TR0341000353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a664e17d904856a50110ef9c24c76fb528832add0b0b2417bbb6cdea418b34c. 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/TR0341000349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19b4761c0f01c607ac457b50236ac944014a0800a7fd31befba43b9581e91c6e. 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/TR0341000354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b2be36b8ef4665c905b14ed6469c59c95736e350db2deb7a700f12f17e65db8. 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/TR0341000346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x506e28983021db858aa8d2efa8e47791a721104ccaed3975dcc8cebeb5b58d93. 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/TR0341000345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x609e5e63bfffed2d261dba526bdc4f5830afa6d44494aaae0caf6185505ff24a. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/TR0341000347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfba03383cec12dd3e934dd09cc0898aa80282656a93e3a20667b890243e1a0b9. 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/TR0532013361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xece0e91d31dd69765f8ee55f651069758cf92b96ebe2d50548e6dde58d9fa99f. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/TR0532013448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f7ed0b1acae42a4b3e6ae85589944246d1bfd627acfd5ca6eb847862c29ed27. 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/TR0532013472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9069a845728cc15d14eafb11f7bd0a250a6ab214b683455a056631f9254c84e. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/TR0532013447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5219f517613320b877b8abcebfe85f5b82e66d70ba0984ab471e3b94f3dd5b2. 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/TR0532013471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d22074b927b5517046857236305f8663a28652bc2fc82fdebd5c506a28d2155. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/TR0532013473.