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 0x2b679ca79ba0f25cbde2f37f3216a8925453183565bf9316a73e09430bed8596. Chain 2 (Bitcoin): anchored in block 953808 (2026-06-15T16:45:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f51b86f7-ce70-448c-a2be-f29a5aaa8e8d.json and https://artists.proofprofile.net/proofs/artist/f51b86f7-ce70-448c-a2be-f29a5aaa8e8d.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 0x17851b83da7976c38659826349b2c3186b9eec53c58d799a34e4095bb225aeaf. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZZ782465235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd47436efab11b3be3d2843ba264a3fc360b9646d609aa80083d8d5d42d6546a6. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZZ782498175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd242244b181c3c692c1726916aa46c952255045499208e16620d2f7f083ee302. 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/QZZ782498168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14300f7cbfa7754d37e154c547f446c709136d5a96aaf92adc5737b590abe8ec. 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/QZZ782495473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2823c7b9b1236a9ee77b55e84b815f9dbdfbabc99ac8e4588f5fe722984e9f5c. 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/QZZ7P2475464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dde3e1664f9fafc0b52f8784bd5f8fcd0e034dc6a9eacca2de89a72ac2e1279. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/QZZ7P2475468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ce4dde1fc86b236ae6892036f5f50493b67811f44821f9dfb18d8098d9409e. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZZ7P2475509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb70bf88345f4f26ad763639d82662e9d56a70240b60c90dc549f7b669edcf9a. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZZ7P2473155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca495fa53741445b99acc665c46ec0d09e97bafe7f821a9c9bd27bb4f83938a. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZZ7Q2466915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa89f0248bd2b332544be5e3e1a2c7ec50f8b472c768eaa6a27e36fe44d9d0b93. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZZ7Q2468572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bacc2c5e0261571a4c3be050ba90666e0ebc55757df1b036f0538d930304923. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZZ7Q2468571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x550f254f9e3c5fdd21b1ba1b668f9209ad853bc78b675b4f50ccaa356c61d142. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZES52530848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6097b6b1e9e48bf804e70f08c5e3a5f8f5bf9aeb298e0f03bcd1e02f4674c15. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/QZES52532472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc05c03f0c964a538c0d51691fd283638b804b78fd0b5413755d419e9f2413ef0. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZES52532473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d66bcfff38b6563165e9fe76a4f79629a4d6ff091cdf38bf74b619ca826badf. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZES52532470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f6cc9d92c886d7543768cee146239631580b6a05d3e7f5a1c8715ba4e29bc4f. 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/QZES52532468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0af09551af303f96e2f8d37ecade9e6cffc6d747e1ac09dbcb9ff21536767e9e. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QZES52532469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce991c15274d05e2c9fc40373a2db6ddfbc83215c0ae30ca3adbcd1961a7ec04. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QZES52532480.