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 0x57ced2edbf8eb4e5204f811948c83f678e752db121210d5db5b18b8e6d9a5450. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/25df25d7-f313-4cd4-abd4-a3bd9f1931a9.json and https://artists.proofprofile.net/proofs/artist/25df25d7-f313-4cd4-abd4-a3bd9f1931a9.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 0xc7822738031c9243010e27bef49f1992e9e1f760aa5cbadb6d52144d5482e9cf. 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/QZHN31934100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf363dba8074402047a3a01cbad6b00d3fbbe64b264fb9e0341d049ce731dec9e. 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/QZHN31934101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca3bae26f50f7d1d2228d75ffe27806468fba3c3c5eb0c707c8957c7b0765228. 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/QZHN31934102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69616d9dacb84aae92b341346049d30f24833b8c2a18a73dd9d658b900620dad. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZHN31934103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9801af9655db7d3172398988f8377525090b8dcacc53089a986739ef6421f7f8. 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/QZHN31934104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a54290bed477fb1b8175ead65fae3455dd7276d2df66366cd41e0806888e07f. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QZHN31934105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a3e0adcf46a2880c078e0d6cf9060a8b5525cb0c44827be86d42ce43d83371b. 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/QZHN31934106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f55cd8db813b7c1b25e4b1cce28ce4ce844b8b33311b2e902612df6ee3f7341. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QZHN31934107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x066b4e5b6a785b3e59c32a8b940b13543b2b7fa6d7a764a01577a53c37515aa5. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/QZHN31934108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b40b6fea9025cb639652388502842a3fddbfe51e7bc0534fbc6e880bba9594. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZHN31934109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46bcfee2b66d1e2abe278fb1284b1fccbf01de7bb19740e6a027198c859a7fba. 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/QZHN31934110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaecbe376ea9ba748f69b6cc4c58a5a08f5905dc9dac879eaa39385ca9e7d11c4. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZHN31934111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef479bb0db5d015172433e0accdd79af577adb8458221414377f9e302ba08dec. 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/QZHN31934112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4fe5bd71ef906d4e74509c9814001a64eb81c9afb764c156373a824189caa4c. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZHN31934113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d1f685b551e86ef10bd073293fcd12415f0206ac1680d5a99f45d93f341e4e. Chain 2 (Bitcoin): anchored in block 960419 (2026-07-31T15:20:33Z), 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/QZHN31934114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1e1c435e60779de86d4e8e35731816c4fe794efa2c71d79156428f6344e9d08. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZHN31934115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x690a45d3cf20ca45acf7110da4c0d8c675aeadfa280e87c5a2b649caae225f76. 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/QZHN31934116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73b53dad38b2619f1ffc93226e6cb9913be5d00cb69a00778aa2f5ced5222a4f. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZHN31934117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2e0acaf0e6205708e5fb6c7db04b1bfbec3f700c0e1a61ab9940985ede070bf. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZHN31934118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x850da484e86695ed9beb542264e368526f27e6d538f39e7cafccd8b6b3b116ce. 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/QZHN31934119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9382fc4985bd7e44a561a54642ea8137184d9f4f19afc9fb749ee22112b4de96. 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/QZHN31934120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef6b689409fa9a9fe1b14f0cd076998c062236d444021d1bc79014536c9ba717. 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/QZHN31934121.