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 0x8d27e4a76eeb0e4b06dc8a484a33ab8b29bdd6fba83026bb8465f8cd23765f55. Chain 2 (Bitcoin): anchored in block 953588 (2026-06-14T04:52:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/019a4dd5-ae5a-47a5-a42d-a1e9821b7626.json and https://artists.proofprofile.net/proofs/artist/019a4dd5-ae5a-47a5-a42d-a1e9821b7626.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 0xf359ca447098a2704dadf51498d0455469736430c018c6a56aa730d8b4406b1a. 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/QM6P42322144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5945952c27db191b13bd2cc66d4a1284a175dd7bc1e275313531633aff493fd6. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QM6P42322145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef8040b5e630311a18c8632c57a36d6cff04afdb1666fccb19e650d44f9dcf61. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QM6P42322146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3665ef96e63334fbefc9bd22571c7a12655acd14696d75999c8c0d0649ca16cf. 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/QM6P42322149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7f6f6c4ee9dafe185bff5c6b943e4c908ec1f5ea5719b977fa91a700551a400. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QM4TX2321452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b94549c7df0eeb67881cd064b2be46a58acd1ed58ea60b40c1d72a091194af. 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/QM4TX2321453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ad85cc339525c3ca768a60b4b4d0a390c3da73027f82855bdabe357a76ee4f. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QM4TX2321454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5142d95312d751c999b43f271454e3a456fa4a94adf41d6a683478507b6e4d4. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/QM4TX2321455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6936f8b07d4966f5311e04193d5a06ac4d5463556ccb71dcde730c4f30b1a6b. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/QM4TX2321456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2166803d5358f999d1f833292411f535e934fa5ca65b3833c7e2e138a461c0a8. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QM4TX2321457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14fb89c873eb0ecb27f464f71abeba23f9fe2ad440dab35068e05e0dda292131. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QM4TX2321458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d1aeab04549f126d9e323f8456b3296ac48c13b57c3bbb949560d85a7e1b0b0. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QM4TX2321459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31b35493aa38fb2571da7a71ed2c5726bd7e71db4730be4dd5757405e1ae892c. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QM4TX2321460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10e32bb9d8e5899a19e5bebd9d93c0a632102a95117e87f3b6520d5028c8a81c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QM4TX2321461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84e6a45f8982298b4f2774cf9866ffb76efc780c90bf8e220595a0c16d0aab44. 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/QM4TW2569066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2104b9e075660bfcf5ab870e6095966a27b54ca584d4ca414ed80b9ec481288b. 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/QM4TW2569067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fe8414e4fcb33700a5f76d68711518ff35dd395d1cbe05daceb1ac534d3e093. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/QM4TW2569068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c01cd389b799b0867c42e4feb8b5c54fdb94ec3010b19589e1f0350ad5adea. 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/QM4TW2569069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0addf2a1c5bfd709fb8763357fd7d2f1f2c0ef0cf06c91ca2d4e5013307a084c. 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/QM4TW2569070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49679ef37ede2bcb63a2d48945d566177d2e0f6277fa40e4c43530913b58a4ce. 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/QM4TW2569071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6739215b248e6f035b29db9c638dde98a4a6046d6280cacf9780c0514ec8f6fa. 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/QM4TW2569072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d0007f5a0a56257c2e7b873a18e02c00441efa8115c549100322b5e37bc610. 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/QM4TW2569073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8ad56a0592c7d22da66f90d3b91dc0eb5d344ed86f86750bf197f828ca78f5e. 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/QM4TW2569235.