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 0x56a21a4eb580f88567b8d4d7ae3fe8793cf3f78da56b3701ef0cb09396108363. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6a91a77a-069b-4f03-8124-49fce5e76030.json and https://artists.proofprofile.net/proofs/artist/6a91a77a-069b-4f03-8124-49fce5e76030.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 0xb15fa21193a5ac5abf886fe9e3ef275aa24335f97013c976edf0722dfca4edea. 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/INU252414726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47725eb1464a55ada9ee72878e493158745eb124d1b4d364db80007b4b32d9ca. 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/INC622214295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ba059762507bdc9685c3f7fa663ed35bd8bddfc2f339516e5cd292b34046efd. 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/US38Y2406365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x066c8bf346ae83a253604d411bb968da30cbb7e1f45dc712a1c26800e0e8efe5. 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/QZHN52489015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86078b8ea44dba9d7b9116e1af1ace5d9eb400a119cdf7751d5eb390a4647609. 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/AUBEC2405135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fdb66f0784664939d21429065fe3bad676a1ce9951e8168fe90cae1b1771643. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/ING502300254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1a9872461b85cdeaa74b9777fa96c24575006586d6532f5176cb0f77aebaf82. 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/TCAHK2378370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a0325cb1229778e4852eaa4fa9c5531b23051d98822ced598d9551fc30025fc. 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/QZMEP2348228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5059d42be8a86e8d3b8a0270387070a936bc2c65e1109f846396c585f620a202. 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/INU252310369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb11e47ca9d566e01fcaea2f1a0d69ff0f1731781963a67982c6c15a1fcd5b0a5. 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/FRX872342046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08dae642864f616e4df9ebe99843fd9bd100e47648b8067b6eaf4b9d79340435. 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/INS172303472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb96c11806954fbc6825be225d626ad2f96ba185f661135586e4cbe0b77ca028e. 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/UKJ8H2302771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x716421f7b980696aed222ccfb72c72f02cc28abe0cae1cdf86aa91887ba23793. 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/FRX282398482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2bdbc8b5280c9d73adad4ecd5b574b5f30735d5f8e0bdfe065bec5271e6277a. 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/FRX202417573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d62d678fc6622b8a196030eba3cc29646ec63563cd5f5f1117866c01be2c8a9. 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/DGA0P2318903.