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 0xf814232c1c5bd3d309bf88b5580adb5b7829591238527849315c729a92935ba2. 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/f551913f-77c2-4894-8ccd-18f32ec9a993.json and https://artists.proofprofile.net/proofs/artist/f551913f-77c2-4894-8ccd-18f32ec9a993.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 0xc5a6cc67ff7b33709498b03d610449b6911dc89b39ef1de90df5e922d96fd786. 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/QZMEN2308309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb257ef6f3f840859169a28b4d1e33647daa1a9283812cc266f1e39287798ab30. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/QZK6J2362294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53aab7ac27d8a8f4a889b919c83c7581d19b15ac4d3957dc13715451227091d4. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QZMEP2398317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddb8b940969a34540dff8bbd0faedd1b8b2a7933cb3f3b0e022c93221de5baf6. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZTAT2383903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd63dd3c386708dbfe8629bbc36783bec8e9614cdfca40a87d14570fc50c641e3. 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/QZTAW2366491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcdc97881ef40bb90f7f8b41654c0e09cb57d06d2a4026859a000dcefe42244e. 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/QZTAX2356036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb91849cfd9d446b1ab007c8fd6ba7af13c2e32dc560a6febadc15a0363b21524. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTAZ2387081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4931c8176e50c944c861e2e05dafe44fb13d5199576f43d28784e2490f0d833a. 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/QZTAZ2387078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd3dc8a37215a6585f814edbe4070674b13838d2477b60c269e765370dc4240f. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZTAZ2387077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5b2f508f68c76e1ae76d6e7d397351b3abaa62a5c401dfb88d651214ae55aca. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZTB22390337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x575639d68c299776abe4e5194788c51abf502b92c29e94cd24d3dc2405e3c555. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZTB32345173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x907eaa1beb8f7c8801574fe3dc3c9f320f8206c940a744f4536a0427a187aaeb. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZTBA2362355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09f94e73b1a6a8ac33ab14604a5949f3ae179b629487128c7286efa4f41aabe3. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZWFJ2326895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc01b86949372b471ae1b7afdee899597bfe599d52579dd31fc688f97bbd96268. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QZNWR2461704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6616270046081183d9d9f85ba12be812cd01d34c38dabb10384e40ec768162f9. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZZ4J2401603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab26f91995f2491d4894e770856aee42d96ff08ff172ef98df3ef4c4cc7917df. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZZ4J2502549.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x973c82a705a6b049951ee729a5406b4d1de2673124146f49545f47a8ab3f8776. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZZ4J2502969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62d42997a593ee8a7c6ad463f4a00169553fa1dd41974c4158ae6b5ac11e981d. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZZ4J2502970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c7265a0e56ee9f3b54e1c890d747a10b023014c9fbc9a0266ea40cb19cc56d. 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/QZZ4J2503104.