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 0x1d0159016596ad2dca95fa161a41c177ad039c0f854095f69d9573ceb78d9dde. 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/ba3dfa7c-dd86-4ee8-b74e-47cde89bd6ae.json and https://artists.proofprofile.net/proofs/artist/ba3dfa7c-dd86-4ee8-b74e-47cde89bd6ae.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 0x972208b80ef65e50207d8ce34bb25ef226a5bed3a03747227c466389a961fba2. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZS662230956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7e81fe4e5ecef1c226ea3d9d82e06f3bf3eb2fe84ced0cab14c923a3c328e30. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZ5FN2146612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46e47cc2ac6fe4feb8b7c87f7a3f1e10c5c7f42499eda896b5364bb37ea7c1e8. 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/QZKDK2042654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd145f1cd2f6dd1ae3eea45b3c6edf91fda0bcacb0cc683ae968bef7050099ea. 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/QZMHM2296433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d81056ea0b5d9c8046e72fdb0eff6a083a1309a3ac7dd2e766b204ccb66031. 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/BRD1E2100056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f666527558e843036a0db8e209d5a16056a63a97d495c20172ea4f15260379c. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/BCEWH2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b6dfcdefa90dda116160025f689323cc76f0e414479cab089f5518715147809. 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/USUG12404620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77e3d276d9faf08617788638e5da99d369967758c4c48725cbe7024232d9bb76. 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/GX53U2358382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4b0a65b1604978f87ef525292dc201e719b182a9ad9abfb0518cb127cdcf089. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BRRGE2400132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa91a4923dfdbf71830c5020d0c0c9ea66959f94565a49b99d07557637c0b755d. 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/BKGFL2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4b0a65b1604978f87ef525292dc201e719b182a9ad9abfb0518cb127cdcf089. 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/BRRGE2400132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8c24bbc4ed9085273bf9902b0f10ed00b30465ae0de2b0fab45af3fb3e24078. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USLD91773302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa91a4923dfdbf71830c5020d0c0c9ea66959f94565a49b99d07557637c0b755d. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/BKGFL2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0be357d8d4e6fa808a753afa52da41e7135dd4283c44c1a7a0c4ce728d874080. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/ITHD42300004.