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 0x4b64a5767eaf416332abb3cf0ac5f8fad1d9307da7fcaf3b436c3da394ea38f7. 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/88db2be6-9dcd-410a-bf01-906980de66d0.json and https://artists.proofprofile.net/proofs/artist/88db2be6-9dcd-410a-bf01-906980de66d0.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 0x2f6a876a4d595eb77becb73d8b4a3e689c4ed6bdc37a189bdf1f94302b27da5c. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T19:50:27Z), 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/QZHN42235407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6535ed36c36250fc965f4fd837fa7d187ab7a85ab5d40205ae6ebe3852a2732e. Chain 2 (Bitcoin): anchored in block 959011 (2026-07-21T13:26:15Z), 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/QZPLR2189550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e09fc376d4e17f409a2c4389a828c0e5d8c98983b0f0998499f117ec2276d5b. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZHN52277138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdd55070175e13a1c1e91a57779989d7a5a80d318c3de33f2a1e39ad8aee2347. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZTAW2215835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3752adcbdcd5276fe7a1a42eb70c5624cdfaadf11fed926f620092624c81c3bd. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZVEM2312216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e5e14a5163dc66eb489fa6f6298a03dcd76f75f46277f2e29b9b16854ebf776. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZVEM2327398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc449ff3821119d55548285d2c45cf95f648f50b2d38eecb277734b2105a807af. 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/QZVEM2327557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce4480d658045766d5618ef0ff246086b4dc578037d1f2e7244372ba91e3474b. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/DGA072315660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x319688d62bc89e0df870fd608a11a2514f78800db5360271d62bccaa2acbd243. 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/QZVEM2359425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x928c05662f03d15baa56a7603397c1c98e5cc3afd12385d82077b2013bbc3c85. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZFZ22472985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6709b033369eb51c2d0b94edea88e78b02ce23ff3116086a8b4cf5fc3962343b. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/QZMEM2404278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0146e8e11f6ad4ba81f22d0be7cbf4c528589ef6de31ae2dbbfcafe021a93abd. 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/QZPLR2484981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed874e9487006855747abdefb6cdd3602a8f28b0d3ab91bc2c841dbdd15e745. Chain 2 (Bitcoin): anchored in block 957965 (2026-07-14T07:07:52Z), 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/QZTBC2487412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa94ab25e079d176d3d337347ba432dbdf5680ccc1104b26130ca8d4c6e96dea0. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZTBE2559799.