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 0x5e1c72d335c23200de7797f751184f276d0915912616e96c452a4b409e4ba214. 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/a71f5d03-176b-4298-a564-975e96080f26.json and https://artists.proofprofile.net/proofs/artist/a71f5d03-176b-4298-a564-975e96080f26.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 0xc739e08d87e302e16ae04044ad4f68e711d1e4e350ee50d337ebc205132ba5d3. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/USCGJ1737207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2852918f1018f44e1da8e1be5d0a9a392021d6fc98d85e531173f16ef265b489. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/USCGJ1737211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf2c85155fe5bcfc2d68ae25e090bb801e8c4eb10e19fd20aebe9c7167259232. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USCGJ1737213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc739e08d87e302e16ae04044ad4f68e711d1e4e350ee50d337ebc205132ba5d3. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/USCGJ1737207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcd1c9139f23a87e917b2eb8bbc0b4cee01121455e52a24746bd5ef26e8628b0. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/USCGJ1737208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf2c85155fe5bcfc2d68ae25e090bb801e8c4eb10e19fd20aebe9c7167259232. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USCGJ1737213.
Hold Steady / The Hiding (Mahogany Sessions)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07bd04e2b5ae4c5e8e3e3f53ce2c3f54b8f96991dd8fe05f6b099560fbf27121. Chain 2 (Bitcoin): anchored in block 958495 (2026-07-18T04:39:02Z), 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/QMEU32020253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0adc78834cb1b0be042267ac7f897eec724352fb272f93d06f0f5442ddbc141. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QMEU32020261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07bd04e2b5ae4c5e8e3e3f53ce2c3f54b8f96991dd8fe05f6b099560fbf27121. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QMEU32020253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17c0405da318fb130cd2a1eeb831e94b535b8e1b2e66d4cc39b85735d564b42d. 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/QMEU32305337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf788e24831f700e6504cf0bcc19651468ee5fff9d032d85a8dcb8dc27c16a6d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QMEU32305338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bb807dfca50d8553c7501ce1a70fc402210126e4efa5687e3797fe6e5dd400a. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QMEU32305340.
Touchtheplants Presents: Breathing Instruments
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85955578d15671af05f1bb84e88dcca7d38eebf5c901a20f7955a87e79cee32c. 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/FRIDO2011508.