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 0xd4a812359ff4ddd196c4c228bbcd819e7691683b8a27fc0c1761b532c8155899. 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/f7cc5d8c-cd1a-4731-9652-e8eda50df028.json and https://artists.proofprofile.net/proofs/artist/f7cc5d8c-cd1a-4731-9652-e8eda50df028.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 0x757032db891d3239fadca9535a339fd4dc4d137203e49132bd12ed7456cb0de5. 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/USWL12100073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x650ee34e9ae50e41d0dbd51ad6e3107a1932ec5a9d8877b8f71c211b05b19ded. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/USWL12100071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x654c925da604fe6bec723ad2aff1ffa249942cef67103383c4554500177879e8. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/USWL12100067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b9619198ef451d2586fab4ad4f073be6fe2f45cbab1b3ba0ad66b5afadda144. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/USWL12100076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b1fe180046130e37f72099e881dfec5ead2a3464c23f1d13ec0f3612cd1ff4. 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/USWL12100028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd097cfe3548e6cdefbd50c9f0381dbd1882a7b22abb20522e0ba53618da0747. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/USWL12100339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8ec812518658deb638356b3564adc8e9cf03b995ec11f83e32205348115a2f4. 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/USWL12100429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1130c6d50d0f5a786e3bf762c61a5f0fd32cb26efbf5cc233dd62578a4b94264. 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/USWL12100699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa83ea38e704cf837ea67792fb839b1511ce5bd0c9cb5346c4fbab7137eb30e0. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/USWL12200039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d78e127739d2a5bebfeec178da8104f2a5fccd9737a782dea26c3ebaed005fd. 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/USWL12200088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb32cfbe13a92aa3e42171aeccf1556f7cc3d84540fe0385209e81ed79c7343fd. Chain 2 (Bitcoin): anchored in block 957833 (2026-07-13T09:36:32Z), 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/USWL12200170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70dad1dd32809a6e39f2fa36d3a193347494eb4c7c051ccf65916efd7ca8263f. 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/USWL12200173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x105d82f5a58643b2ffa8a06a4379bc1e75c9d6c31c987e6426ebd2fa4f931037. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/USLD91752705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99955715308a20d16bfe724d60c4aa6cdb536147fd8baf9bd048897c9e9eff33. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZDQH2438590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd56ecb1f5a0e27ca206a133c68aa5d84b698f7af24a7409789f2b42002fbfc55. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZWDW2592154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c714ebb024c4831d9f6846d69d1b8472b5f5d61bb37ec0c972e22b45a183110. 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/USWL12201399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda2ddbc25e73610859ed049bda6cc10358c7344d10195923e653cbe3b7aa8b16. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZW9L2249901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77c661aba2105c4085e634b891e5c980d7130a75c7380faacc2641d741d25352. 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/USLD91733386.