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 0xc69d54f89240bf55235c16387160135befeb418fd783df83c8947213ab176124. 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/40d5bdde-07da-43a7-9802-5ab4944b6891.json and https://artists.proofprofile.net/proofs/artist/40d5bdde-07da-43a7-9802-5ab4944b6891.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 0x0f629be0ef9e90a15c59d89ff59c6298ea68caec8b8966cb9af84f4c209e1f0f. 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/ES71G2417518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf447deafdbd7043313bbe6583fe6e7112d7c7079820ff4276a0e00876b10bd3. 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/ES71G2417519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68a42048b39726a224c144341b5d6885803848713540b9bc43d79d3ca16425da. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES71G2417521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea72afd7e9e424f8883d92a051ee9aa21a2b02701213e693b62464355fca4f81. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ES71G2417523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x740018f481584344760db198dfc5d74639b40cd69c29c85cc367b4b6685cde22. 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/ES71G2417524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf02308df0be92b3a19925f6d3b1376fe6d9d57485be9f1acad1dacf8ce14e25a. 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/QZGLM2287441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9122ac0561b45193e7a4fc016044904922f07099cff8bfe098db9fb200bb85fe. 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/QZ5AB2206415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4a77878ebf5952765fc150faad5c123bf090110dfa893ab19965b4165c5dcde. 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/QZHZ52188766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe877a45ce85354db2bdb4e7ce081af8c04e92ed20ed91c31c8157f7a95b801b. 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/ES71G2129952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29b2553e3c28732af68a198f1e1b98f32a8faa85d2b54427c0636a661f77268a. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:08:24Z), 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/ES71G2041159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8ca7b7e131724f7589b5eecdc2e9a23c5032614915b3286420116d1ea0d3d4e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USHM91975724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe15218edeb9a3940c52ac476509fedc4ac2c3c166c90e7c5098c0b55eeb26650. 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/ES71G1856032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b9e5620935c26211da7a01a08805397036c3907748fb0425bd604adeac4ec82. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZW9K2342569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x054a35b8a33fc0cb1aa5f462f7eaa64331732cae7cb74e7ca2ab0442ebb49467. 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/QZGLS2350510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7108f77df4458f57a1800f9b3100193a3da05f5220c710795a008f2e146196b8. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QM4TX2220110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31598ee640bff70dafd5c91f3e36069c6e6101f14dfa3bca7b18108ebc42c05a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZNJX2149630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c8ca9ebacd126fbd0d53e53f4f906301710874610828726d52c36b9ab92f6d2. 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/QZHN62405623.