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 0xd95c15a90692417f6fe84cbf765ea2d8e193fc58eb5f1bc471d923d92169699c. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f855e8ae-fe19-4e2c-bff9-2e61583c7144.json and https://artists.proofprofile.net/proofs/artist/f855e8ae-fe19-4e2c-bff9-2e61583c7144.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 0x0fc96b1c04e0e28f09670f5016485bdfab92e02fcc916a8f6fa229bc2144342b. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QM6DC2099546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99f2030c7d5a0a2b85fadb0f3700cb164297c36179b065174a6fab994095ef12. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QM6DC2088428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83fffc99796d06fb827fbe91cf2af55032647b41074c04dce67e8a3df24c261d. 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/QM6DC2097371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc70024a906da029fde6f6e40e6d648d1ff47b4a905a9d8855ff776fa2c10c74d. 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/QM6DC2099548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a0589adcd4b3c12a26e98e32cf05ef64f96ad3ea6c2f1e8f8f0c6af4b5d205e. 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/QM6DC2089909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3629434320fe8339406b64ca0bdc65f7c0f6bae7ee17c6e55514bf59dff912e. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/QM6DC2099549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d269d83dc56cbd07f3a9138f6336fa3ac773878fd31e4a34aca0d8cb69f1132. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/QZNFJ2117633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe09c7602472a604f6c7dae2b669255c44d102a65c9ed84bb7b8e20033b1a0beb. 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/QM6DC2097705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x435fef9550f05dee363c986da1f197cfc440baa83c35c96bf9d6b6393b9ab7e8. 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/QM6DC2094223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a0589adcd4b3c12a26e98e32cf05ef64f96ad3ea6c2f1e8f8f0c6af4b5d205e. 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/QM6DC2089909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b966b9be5e156941e25f72bc1855f325c4464a01c4c6f7763d1c72783db9ce. 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/QM6DC2099597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62f72d3182a9fd6322f4469b376d4221755c7d4367eac428a30a2f73991eda61. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/QM6DC2099598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x119f327ba3f848537b22c1eec0e3abe4b0580ef9551383a3dc214859ecc059fd. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QM6DC2099599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8b8eba34817b159b7be12d91fabd9b91805e5f242aaf07293d52a0155f5f387. 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/QM6DC2099600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e8b2d60413d1797bb9ea8b596667bb1e451481a92d022f2737f53987ed56395. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QM6DC2099601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d3b232e9833b9b297e0f1b76a672418150d94b983cdf480518c351033287ba6. 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/QM6DC2099602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf8836ff7427b5f68a5a31187dbd1d3fb7381c3be3aa41b5a6a1ecb301aaee7. 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/QM6DC2099603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fc96b1c04e0e28f09670f5016485bdfab92e02fcc916a8f6fa229bc2144342b. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QM6DC2099546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99f2030c7d5a0a2b85fadb0f3700cb164297c36179b065174a6fab994095ef12. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QM6DC2088428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83fffc99796d06fb827fbe91cf2af55032647b41074c04dce67e8a3df24c261d. 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/QM6DC2097371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a0589adcd4b3c12a26e98e32cf05ef64f96ad3ea6c2f1e8f8f0c6af4b5d205e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QM6DC2089909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3629434320fe8339406b64ca0bdc65f7c0f6bae7ee17c6e55514bf59dff912e. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QM6DC2099549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b966b9be5e156941e25f72bc1855f325c4464a01c4c6f7763d1c72783db9ce. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QM6DC2099597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62f72d3182a9fd6322f4469b376d4221755c7d4367eac428a30a2f73991eda61. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QM6DC2099598.