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 0xa83d3c0c4976f0fca2f5f8dff99442fc49ea55c849dc14d6bcb8936ecf21ff56. 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/bf4315c8-63e8-4fca-9e3e-d493a561ee8e.json and https://artists.proofprofile.net/proofs/artist/bf4315c8-63e8-4fca-9e3e-d493a561ee8e.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 0xc1f425be51e93340d6e0de53a90b16283ef02ec9a96884e163969d2d0f053043. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/DEH741305504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99af83ec91bc5107470f8496e0f9f7a21e99749e37ebb9a0eabe455e910be464. 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/DEUE41500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b3b831d88bc4fdccaeee2d66fb174bead5da04635b95e2505f7d6348002ec3. 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/DEUE41500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc20f9455963e9f2ce075e3f2aca7a9e2fe7ad5f4d2d17d5d94e11ee3f4d887f9. 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/DEUE41500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc340606baa32b74e11b4e2dfd29be7f506eb39b2dcb79433831c42d3b36f187e. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/DEUE41500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33eb212ac0640dfd1978df8f481837aff55a74397a37330dc04a27a155757dee. 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/DEUE41500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c5c71089e85edb82178abd357a3d9e7c6db0dfb46ab2a298077e9db500b79dd. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/DEUE41500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee277591d705a0a9a68038d7f1b89e7f3f82ea0c31289e71f9c3caeebb41efbb. 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/DEUE41700009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6454c0482d9c5735e22d00793c6311b15190cf7fae9c94284fff21052bbf2177. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/DEUE41700010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bcca50e53c4179877cd4b3aa172dcccf75ff2a2f17b98438cc9901d74ee5490. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/DEUE41700024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3076d7ec0409e804b708f95fa8dad83a3aa4db3606c7363a40bbd39a352d03f1. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/FR9Z62000387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd64138a6fdc0d7e7b87d24f03d2901971fbeb3f5168cc740444e7b804a1135c6. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZFYX2181516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb274b4f14788b530947140a9dad606f5345cc191cd568dbe3b94b8be004f88. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZFZ22368651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdb7054962719853509b88d24b74379e7b44155e92f947fd6b3f63dc2515a9db. 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/DEEE71700870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5fd2945f14521cdb0d63864869f39efdc7eee18f64d443ea629fd77521a4303. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DEEE71700871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe09f4f912c5d5ac7a944aa331722f3445842f84b7a0d4ada640b248297275b75. 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/DEH741305506.