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 0x28162365074921c40d5d5b70bb9c33a41da7e3a47919ebe467ed1583f8a967b0. 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/00855f13-649b-4f93-80a3-3dd4bf0154c5.json and https://artists.proofprofile.net/proofs/artist/00855f13-649b-4f93-80a3-3dd4bf0154c5.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 0xee2072e5a6adf5bb671367067b8f7c5d5b91e7f3a375204bf5bbbe920f73ddd4. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/ESA011974564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce89bb3c5061e5a354d94ad6bac12df775a8c950ccb673ca60ec692665ad207d. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/US3DF2064883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c6854a36d976dcfa2758f958cbc4fb6585134e4df8bfffefed99e8bde869442. 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/USANG2177555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b6a2703a2290f16dbc2f7404d67364dc2cba5423359e94777efdd66efce751b. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/US3DF2120654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeb279237759ba10486373361019b2d3400e6013f04ea1792e006dd6c7caf6a3. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/US3DF2120652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc49101d062ab9e603c8ed349901e4a7e7d0d611dfe8a13d28a659bc612497505. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/DEQ022381360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x857383052aceb02995dd83264fa69a4eaafc90a1cf2508cf25048fd676740e9f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QM3DF2256321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b65f9ec08817448b821b28d1c0b487c9f0d4bfb48b29fd0c56cdc62e098dbb9. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FR2X42427635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x367bc26ca2a685c4d87714449f3813393bb61d2fc267940539844600dcc938b4. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/CH7812418518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbba17819427b4c2a5cb4ff033f67ec72d26a72da0b57ad21a4f174577c8d1ccc. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/FR9Z62500086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebc97501378888b1438bb326facfdd2a13bba770b669c2787dd7d5cb69a38467. 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/FR59R2558571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf669ae4308e34e406ee5bcec5c44e0efa6128cd4eb8faa0b2fef636662086d3a. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/US3DF2569699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa25db0cc6ece856bc5a7ffec21eec7fd4f56611a9069fdae22e7c89d83b53490. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/US3DF2574980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b4b784a28ac11023ae96dedcbd64f621a5a665937e05942c3a2af8162913683. 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/TLREW2226455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64859a4b1bc7812ffaa51d59f269edb8ae78b3d6c7241ce5a0a93374d9402290. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/US92U2400949.