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 0x7ed211f78429bd6831b17d6d3e14ed39c8baf74fece092f3e095c1589b9894f0. 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/9f210013-01be-49be-8221-70fbe83ec2ed.json and https://artists.proofprofile.net/proofs/artist/9f210013-01be-49be-8221-70fbe83ec2ed.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 0x9f8fda89ba174db627ed0081f2edf06b7c5bcf9283d1cb326bf4187c6d6d1d2d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TWCC32122330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5d3adda862b22acdaf14382270746d86a71e45144d81d3fde84bf8aa44a9a6e. 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/JPB602000058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cfe24136226a8035888d451503e14902cc6f1bcce7fbb553ef2e3972b703a41. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/JPB602000059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04179ba21189703564baebe13aed36342dd669e164c279895bc1027dafa9d3c2. 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/JPB602000060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x897ed3480069102a470b6a9849c98bc0c1a1fe818359ddd3cdd73e16e0ea0ac5. 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/JPB602000061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x875142c91885a52dbbe231b36e90dec4d3962188b53ce513cef9263928900b7c. 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/TWU712001796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69b445626bf780318152fc3a5296c080d7ae1b99b88a3d36402921fc3dd5963a. 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/TWU712501106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x157678874fabc926ec5867bd9685269e1536cec38153b200550330319cf37181. 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/TWU712410243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36ed8c726c689a1add39a1e98108257af00696020228ab6c9c9fbb2b9f61f0e8. 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/TWU712406344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69817b01ed9c1cf3b9c41e06bfee243fcd177cd2be46367ad792fca595b1a796. 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/TWU712403536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x463e2941bb40c78bf22b54174358f710da5f9ff5ae708dc070504572714ad604. 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/TWCC32400644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ff88e084122cfcda7ba6f51c2d0604cf83bd251569c3d84c84a6806d3876ee6. 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/TWCC32400477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62ff594d6405bae23ad1a10794dc4ad6ea8853ebb6ee7956d8ad814831ee1297. 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/TWCC32322106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e5fae8039e883448b2b97208b1287030d198bbfa2c02561cfd824289d3a0486. 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/TWCC32319952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbce4fbab0afe05def0a0c1b7c74008ddc5243be6a652df46b38cf26062dfba13. 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/TWCC32305390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab370afe27ed8ace7eca9615eccecc9c0f7dd85c4f95592d26b3467d6f48e5b1. 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/TWCC32302086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6197b28a4edb9d05932e98e9ab98f64c97baf1707288edcab5757d7a94ef7d88. 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/TWCC32208512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x611c1237f4b5b116a51ff1806abebd8ae653e38b9c63bbccf8d91062b9f191b4. 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/TWCC32204362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcefd627a2f2ab96d8c4c6a1b2cb11b6530859c17de45cefc7567c7f38be9d612. 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/TWCC32202491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0fe4f4e3b1ae7e5f7d1fca01a1b745efab736e9792e969c342092c5b2f57e30. 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/TWCC32108436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe88114c3e4a9b63370b4dacab920434fc47f47ade61d2a6cea7d22954f259725. 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/TWCC32107826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b72cbaa4312da8e00ee9cafa80e2a3d97eb8820e6e681ec955192a5bd913e9. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/TWCC32107825.