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 0x2f35ae77eb32e3c9bd266e0b4fa7969d6de37b23e477b55779dc3f54cc802a62. 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/9f9f857d-4835-4c36-80e3-01cd664d1163.json and https://artists.proofprofile.net/proofs/artist/9f9f857d-4835-4c36-80e3-01cd664d1163.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 0xb6b35e01f8955efc7b7bae58a53e74524fa70d950e2a197d4a070ac2ff77ee07. 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/QZK6K2419267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e2620351235d0cb8dbb73ae1c6fb0bdd5f0a5de0e64732ffbc928b369b72a72. 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/QZES92447542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ccbafa079389c2f465db65f6e2b7044432f027cdc671f61664291a1588c0466. 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/QZFYZ2458459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b06bbfe75659377f5cf95e815514aea85cddd748c01771630753c415cd260a7. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZK6M2455021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e2620351235d0cb8dbb73ae1c6fb0bdd5f0a5de0e64732ffbc928b369b72a72. 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/QZES92447542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85409469e87932453a4cc67d394930fe01ffc6038571ade820400ec5e8c9c9fa. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZFZ62414981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a0cfa4d5f917111ba50cb2c10efa20600fa9a0fab66695cfaa5dc3db377784. 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/QZK6H2267569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e2620351235d0cb8dbb73ae1c6fb0bdd5f0a5de0e64732ffbc928b369b72a72. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZES92447542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b35e01f8955efc7b7bae58a53e74524fa70d950e2a197d4a070ac2ff77ee07. 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/QZK6K2419267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd68e9f1e85515489de2284c9c726240ec2db15bf9d73b07e0dc772730a35a16d. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZDA72466479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85409469e87932453a4cc67d394930fe01ffc6038571ade820400ec5e8c9c9fa. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZFZ62414981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ccbafa079389c2f465db65f6e2b7044432f027cdc671f61664291a1588c0466. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZFYZ2458459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8503ffe41c2a58ff08dffc1ad741dec29adff15893af61a98b2a0ffd85c4862. 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/QZTAW2480643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77607d3fe825388ea64eb06f1ffc8750af569a17cf433ce935e0be45c43ac3f5. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZNWV2464239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e540f8682edfde31c9cc0d8f6d4d41ba915b2e3bfe3acc4c5f1c345a00b7e69. 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/QZMEQ2434976.