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 0x6826c8c88cf2c64647c94ff81166505a1b73505aedc818b7b2112ff6e6e6d774. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a5ec86d8-597e-4aee-846d-5c39f75ce5db.json and https://artists.proofprofile.net/proofs/artist/a5ec86d8-597e-4aee-846d-5c39f75ce5db.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 0xe172558f7449c695a1449b07044e33bc547a8d63ca61495d2d0489a8da5757f5. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/TWAE32204367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2f6c30f12aa4d443e3d870813639bb25da77ed0f83ecafcb51917f8160de082. 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/TWAE32203775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc45715d55ca412287e4f7718e587ba97da74621b15ee6af0f9d453cc71d30dc7. 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/TWAE32201407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b6d7689b9d5ea55b8ed608c3ac2fed9c265c8b68f0c3a259d48ddf2df393131. 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/TWAE32204013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a66a360cff720a8d8d0969dcadd06cc5f6b4ccd2cbd3bbc7536ba6cddcf5d2e. 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/TWAE32204368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bd11b89e29f8a7fa4849d4589808c7db846844e1155f57e5c5c9a30493f28d3. 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/TWAE32204369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc175bd28e0bae410c3f89141b472a59b8631b28acb15ed2c4686213ad53c5b8f. 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/TWAE32204370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c72a75d63ea0492a21acb47bc5f30379b59597217978a77ce6dcb9fcebdd5f5. 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/TWAE32204371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b6d7689b9d5ea55b8ed608c3ac2fed9c265c8b68f0c3a259d48ddf2df393131. 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/TWAE32204013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2f6c30f12aa4d443e3d870813639bb25da77ed0f83ecafcb51917f8160de082. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/TWAE32203775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc45715d55ca412287e4f7718e587ba97da74621b15ee6af0f9d453cc71d30dc7. 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/TWAE32201407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dd5def4c50321d80777ba29cfda2545e3a6255f2ea1ba10605cde256b3e800c. 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/TWAE32200136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e6bafa87a49d70a2040378da74f5041266bf5a3f882e1d3a12c43bfb367356e. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/TWCC32121038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8b9bcea89de2ba6d89a56102b6f38aae63acdb9d0c68ca81818c128d6beb184. 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/TWCC32008339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa161f4e523eac61c3758f2be4f5ca9b68f112a1f76d8a54b4bf3a1acfe26ef8d. 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/TWCC32008424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58d26cd1ff238839d940a1ff0ee77e51382bd7b728cfbbe0650f6a7087749afe. 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/TWCC32008425.