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 0xfd91baf05aa02999c720b260044380bc3b9f2a0729a1aef3739f98c4ed8d40f4. 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/356d5a0a-56dc-4142-b6e9-38844e7efeda.json and https://artists.proofprofile.net/proofs/artist/356d5a0a-56dc-4142-b6e9-38844e7efeda.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 0x071273e088eeaa21f87564a9c2a8e292d44ef9ea513e6037650704dbd8395a07. 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/QZANL1798926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86b25f48027d0b77c547bfea73f3850f9449158dbdaae99cfd1fb41cd2172842. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZFZ21989009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0b9386700772b176a8cdfc975659c9b695de6f0688b9375d212ddee3e74c24d. 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/QZDA42018864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c7b4f7bba0889540681cf6fe73fa8bd704224e5f10c94a53c9ae11e95dbd1c3. 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/QMFME2360288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaa5564634e1d01e0e02519081cba8374133378647b9652e2c328eeb04a09299. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QM4TX2412816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa3691e12636bd20c39e6086b76ed296cdfff7f1b0f4696bbc3fa234dd91d2e5. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QM6P42459457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cf2fb14b22b66c8c9274242db55129ae697c5ab18dcb506d4444bdd4b1976d5. 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/QMBZ92424749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x610e8f2d932857510371ad826bbba53af03c1efa46d4715393d3b04ccc614eaa. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QMDA62422939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf965d3ba8d7e5931ae9328b1ac46d56df6a962d851b009786882be3e9263b160. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QMDA62412780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06b2d896f2b9541a6be2f52115408bb474d51116a779a3faf0f1b0f3395c8749. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZWFX2418448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0998889bf2fe24f49759d1ab5648d019111bbd40b6c9b85354e6bd415ca6de4. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZWFX2418449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe69620c9c239d27b4426acbdd9498abbf5d6fab60ca2cda5742b5455c3dff09c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZZ7S2466108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaea0c17d5c11469c3fc7b37aa26e30127d4c75b3f4fb30722cae332bc568207. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QT3EZ2478486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x991ed0f1e8e6be024d7d7a3395c69cb049e31e5080d729daadf95ec04cea3a95. 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/QT3EZ2478487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c7b4f7bba0889540681cf6fe73fa8bd704224e5f10c94a53c9ae11e95dbd1c3. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QMFME2360288.