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 0x8e8a1dc5e26ee5f8abbd39cf9c99f6c5b7c3e24966e14821a970b8385766fadf. Chain 2 (Bitcoin): anchored in block 953958 (2026-06-16T14:52:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/27127f19-16ba-4d29-9ec7-f68866d32a49.json and https://artists.proofprofile.net/proofs/artist/27127f19-16ba-4d29-9ec7-f68866d32a49.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 0x0e1306e6cd612100993af5cc639fd2fbc6f72eaf95f1ed15e558b7ed5714ee99. 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/NLQ8D2200853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43bb80710cfff423a4a1168239de32b102fbf77cd69816e68ec028785caf5dc8. 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/NLT2H2200204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3af0038304f5cc97d1b1bb0592a5bfe7be6a0e9106ea7fa689f314356c5895a. 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/NLT2H2200144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99dc535fe506d095bf1c73d39f8abcd64ce23f43e1220d6639cdffb2cf8cafb5. 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/NLQ8D2200106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b7eba01337b421c6cd5878e9ff8e712c2851a9123d937229e418c767cb31836. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/NLQ8D2200247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x507d675e455104024fd7fceb921721f3f0bea46a0b9edaa3958187970202f5e4. 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/NLQ8D2200256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0b34717d6a99505487261bb3d960b09f2950a7fca41ef29a19fcd45cbf7dc89. 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/NLQ8D2200059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd31d636bee93df10f63d27ffae0d1b1af466a7f5ad7a40b62ce624fcbe64509. 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/NLQ8D2200067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb77f7b2913312363f29c0412c273e7eae674c74488cdcb3523412e8b0658c284. 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/NLQ8D2200068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f9b4d7879eb6bc79cf278a38f4e79869830ab71eb288a9b5fff171d4fd6460e. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NLQ8D2200070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea4b7b7028084558c811dd8aec482475e7b21a5a56f608787e86e461ca76782e. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLQ8D2200072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a4be8fcc42e72467981ecab91e3874c8432a7beb385b068de3ef6d399311662. 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/NLQ8D2200075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc87d19236dce731252161cdce7a6689176d9a8e281ca906b08181235ccd86e9a. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/NLQ8D2200076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6945ce65782df6cc3b817d4df12de106f71af84bc13a975b47da1a96e9fbc886. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/NLQ8D2200731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x103379a9007438310c80b2dfa3de7e63c11490ffa438d8a093cde6e727ba0ac5. 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/NLQ8D2200732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf596a98a55bb1255c8581f07fadc771aae29bdd6c3dee8598715adaf76c2ed4. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/NLQ8D2200736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5354cb7da8c0ca8827ddb00ad1d8e14112247470c4676c32203e99fe2badafe9. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/NLQ8D2200742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x330b9c0c77dea65b1c810ead9b2ba7dc922938f0e052647eb511b7ac258a7480. 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/NLQ8D2200743.