right|thumb|An example of converted 1938 Tube Stock on the Island Line, Isle of Wight. Under TOPS, this train and other examples of the same type are designated as British Rail Class 483. Total Operat
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde4e001da786df3d1612965f5d6a3581d57260a8066489cd63fafdf443a513f2. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8e809b19-58c9-4dde-8dc5-8205afc4ce1b.json and https://artists.proofprofile.net/proofs/artist/8e809b19-58c9-4dde-8dc5-8205afc4ce1b.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53a3807ed1e27b3ba26274dc639519713e6950040e582486184e0a6b820fea83. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/CA21O1200019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5abb385213fabd14dfc4297718eeaf7edb776d3ee9368fc2801cdc797a603c0. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T22:37:33Z), 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/CA21O1200020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17acdf37c64ddaf9f46d17a3a88e2b12a8e83ff9da4ad78c9a75a15b81333917. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/CA21O1200063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eba3dbbc79469fe463978c552e4c522ce2eb5bddfdddbd1bfe4fb440be46693. 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/CA21O1200023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x996d081b9800272a6533ad46ecf9cf69ba801b9dd7cdeaa619ffe0834329591e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CA21O1700009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc77959f2087b8f3567a4f696208a262cbe522056ae8f628038105a4485e582f7. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM7281996886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc77959f2087b8f3567a4f696208a262cbe522056ae8f628038105a4485e582f7. 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/QM7281996886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x557f0439a5d2e54746a405dea785d0c6fa67e54fbad47f6790f82efa23186da0. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QM7281993313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3275aca5281a88b3449d47a2938ad9985305806c0ce6280e3deeeb4a73c3bf7d. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QMFME1912620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39cc83cd01d2322d3696e9f4c7087ee28145a1fc15cc6b4431841edb8751e6d1. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QM6N22016073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x403fffce88b7d90f0d7166170b17500e00b0b58b0596a53af198c211a9f781f3. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QM6P42021151.
Colder & Closer (DVC Refreshments Remix)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20e1c5578ac0201d48b1cd993977fca74a87f5247a610189b609a5d2f2b2bd1a. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/QM4TW2244919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf63dfe97388324609507066e3d028c17057b420e538e78eed0c8b810f5f58c8b. 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/QM4TW2244920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38245dc7df43d8ac00ac0d7bdb04d036f3107796775965dd9f60377422e9950e. 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/QM4TW2244921.
Like Someone I Know: A Celebration of Margo Guryan
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b4e1ed94ef77fedeeea969fd7465ed7f835879a1d77301d4c3aa91ce3fc8494. 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/USSUB2464401.