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 0xa6a85b647f3e2ed15f028ae0bebd02f29f939fd18365fda5c7303882bff76d09. 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/b136b167-3f3c-4360-be19-5bc9889c9fe7.json and https://artists.proofprofile.net/proofs/artist/b136b167-3f3c-4360-be19-5bc9889c9fe7.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 0xfe002be6b29a89e945295ebfb96514f47eac4f574a530f1364699fa6d7838f0d. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T12:47:11Z), 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/QZNWX2259719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e80d507cf9c6edd0559256d629ba36f6a2c0c690c6aaf8f6dab05e27d94339. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZS642246341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cb0b8d4700597c7a8d13030bc7010a65e2647b5b1aaeb902da5a47c6bd4ad90. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GX8KD2285731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1fe56f21741ccf7a742981768f9017a50fe9aa00892adbd4392311d8ab2c827. 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/GX89G2357376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x049ee298c4428340544c50b1570801eea6a7249a2e67bd4419afb7276bd79444. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZFZ42310851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5564d714f5cd50da75fb88fc62e4dcc0a38abaced2c6cef2628997302ca9197. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/QZHN62304053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac7bbc8e46413cbb2f8c5503a1fa2b4fe67b86361e33ff4ad61a5496d7d4b102. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USLZJ2368788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc41cd6c27a202b51b65b0d0c5f4c1e9e8eea081ec7a48b3efcbc2a6eedf6775c. 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/QZPLS2424767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa41c729baa3dec374989985f9077a38d95a12bc419340d23e967c4ad7953b33. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZTB82421826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24f586d4367c5b6c65c1b7fc848bd1f801c89a145c073cab130aca331781342b. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T22:55:29Z), 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/QZWFK2429315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbdb95688c1ec029ac4e805f5608fab04f85f58916fdd5cc5b1f374e14a4d41b. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZWFN2415890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d1416786a7fa33a0c218fcb9306b6bc0b7ac18480b285d8218650ede753e4ed. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/QT3EY2436592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b0b86dde8aa7d623767ec4c4f67364c3340dfbac7df287a5fe6565ef1839de. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/QZES72533337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c4e767ff6f843d8909d9e46d45a9028be55fc1e08f11dbe3a97caab833e88c9. 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/QZDA72524059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e8e821f3f3b8def8a1c10c886010f12bfb6e10ac2995382eef2ab69244712ef. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZK6L2513580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87cfffcdd413d682ddad7ed371b806d085c6b096b8f77ed7eeda7f8af57fa190. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZNWZ2596347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ad4fd5822d35f5772a5c670ca66c75d196c4313721a238cdd98e011457522f5. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZZ762590860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93a5c37957f02be628ce57beff5fab0465cb1259bb9f1fce23abd2a1276d1cdd. 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/QZTV32366717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a1a4f5a9b8321b49d4d55825cfdd841e3523833bc3005930ce5038d049bcde4. 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/QZNWZ2337060.