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 0x4646dd274d1459eca9c72b2f3cfcf1ececc9bf21efaceb51cd3c915c0ecea68e. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d8c309a1-edd7-4d4a-95d1-4f81abd80dc5.json and https://artists.proofprofile.net/proofs/artist/d8c309a1-edd7-4d4a-95d1-4f81abd80dc5.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 0xb2533d0a13098d00fca04c76917dac56174beaa0164d472fcb0c5cdc01a6ccc0. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/HUA2B2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47a4f39c601822142b63bedf1ace9c0bb022e2903611961228102927781cfec5. 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/HUA2B2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2db2dee70406e7f030d2d51bef79a92c09523bbade6dde44158a39e42d0bb462. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/HUA2B2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x786ade6ebd245eaecaed09f5351778c3468635f4d68628af3d5c1f61fdfd139b. 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/HUA2B2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9fafb29c0e62ae82c5d077814f0517b223342bb2dea02412aaef8eb254014a9. 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/HUA2B2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5009d329bb5a3c0334a8631b0c189453147bff8771c6ea754a065e620a240b3a. 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/HUA2B2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b6582b668d8f67b667cf51c29e198b23ea775db17bad8b7faade6d580bcd44. 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/HUA2B2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x813bdcf5a7bccaf062aef6e9d9a9c89b3d8558a69dd62bfc306d1965b263f8de. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/HUA2B2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81c9721316716fe0966dbc115333916c12d35dde082a1ecdf9d276c97e7b554a. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/HUA2B2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a80e1970978e7e3c82bf8fc6be85f34e2d11732c15d44ce6f28a4696ca03e5e. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/HUA2B2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x805925a1b69f8b7e7f6246c18ae14ea4b1cd52bc843fba78b2dcba86979d87ea. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/HUA2B2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519be222417d65028ecdc92f5a8f629989065a64f9113206b4e01d37d11b9f57. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/HUA2B2300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x165210c2995fe461465571489da1c981e6c9533111e51b75cf6ed89e1e6fb75a. 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/HUA2B2300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ba2487edf2db84d98cdc7378756e38d8d475ede0b0d570ebe6e3c004305f0b. 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/HUA2B2300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf72dc82cc7a382775ee6020288674456de68a56bd0401590184e6638b71a1533. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/HUA2B2300015.