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 0xfdb3b0715f87daa87ef842a71232cdc30b00612caad11e50655df2b61df531d0. 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/16bfca7f-1fae-468a-8b20-f092785816a5.json and https://artists.proofprofile.net/proofs/artist/16bfca7f-1fae-468a-8b20-f092785816a5.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 0x3f190cb44047c4205c3aa8ccf9943e6ce9b65fa1dc2aabd174aa499e9e5f4e03. 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/SKE010501501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8e85b6211852d65bc6fbdb73230aafd1ac29fc807cfb86fcf69a3de3a4ae040. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/SKE010501502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7269198200ae0d81707d9f0b1e4abe63411fb9dcb6e5bd4834f0fbc704ac5501. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/SKE010702001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cb3b1e398320557ab4c9587b75f500aeedb7e0bba827bb75c140fedab310682. 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/SKE010702004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef8be989a9dcfb435817144abeecc777156fdfbd65b2b8e6b5ee5835e1259015. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/SKE010702011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c7df7cc910fd81d7e77f9d944aa65198171114d938797971089580cbd46383. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USCGH1456691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8532f788446da186b8da258a6146929ee40957bcd8c1572b2452e7c142c3e7f. 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/SKE011608402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2554cc2d9bb415076fbc1020352d807d28610aed453eaf30d85bddd9fe29ecb4. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/SKE011608405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11433031bbe284511bbdf8175a10d19f5043e94759489d868b65a487055011b4. 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/SKE011911705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d0cf145aec963777303a85f7abf996f87ee6ff50b6dddb00b0df2d7865fc605. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/SKE011911707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7976cc6366cbebe5c0e6dea9e5710927f3d98dd9dc4e81a9ccf5f0e25c782de4. 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/SKE011911708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4935099ebd0f38f7fbd752d2ec56a0baf1051603578d2fa5dc8c2025e0f1e63. 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/SKE012012713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1062bfdae9c568ed6eb323e2a59be395f3faf757817e7dc5961182061a233c57. Chain 2 (Bitcoin): anchored in block 957668 (2026-07-12T06:54:37Z), 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/SKE012012702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ccdd412b8ee8c7ee6663b2a948489d3f200da9490df52e203601cc7e2d6329f. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/CZA231200363.