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 0xbf79b196e9f77fb02a745bf8e337d35e9868259dd66989a709701c27632c11a1. 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/56a22cf4-20ce-4531-9ca3-da71ab66fbfb.json and https://artists.proofprofile.net/proofs/artist/56a22cf4-20ce-4531-9ca3-da71ab66fbfb.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 0x34821cd5c11c030f2b271bcf8d0de168d362eb317869a5e3504eba0393990766. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T13:24:39Z), 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/BRUAT0500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1da8e5fd55bb71e06857f280ed2ebedeca9dbb2810f5686e303eddc03f9ca1f4. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/BRUAT1600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bb14d5d7a32c3416cc15e70babb6f818a376ec8c31a1f62ec462ab175ea0aa5. 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/BRUAT1600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x663a166ce338bb549b90b66d6edc7d0d0ebccb42f2fa0fe34d8c2bf175c371a3. 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/BRUAT1600015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51bf44c8633b8389c38e84b8efc8debb312a326450095cea85bb9df93b303352. 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/BRUAT1600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7bad3d980427dd3e93f6ab00dedbc371a194b5c9c63062aa6c662f6a286f097. 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/BRUAT1600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cf04aa632b4ff7b677a0fd166799f3ce4100c42c3e8df05fb0cf82981b6668e. 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/BRUAT1600008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x008a9e6e73b00d6455f8a076a282bc8ebd7cf02774077ed1b64a891a062b0700. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/BRUAT1600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ad0c0a68f14d8fa6df1214c196156870fbee6b87cd198cfdb06c4d60a40087d. 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/BRUAT1600010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e9bb58e1e3e1b8d6dd6eaa8812e0248f427e05a38798f06026a13cfdbf3474d. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/BRUAT1600011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc88cd4f6be78af7593aa600416ebd0753826721810a0d1c995d6fef08d876b82. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/BRUAT1600012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf559a1897d2d1b1297eefeedb05f1748d8d447867381d7c5a4fe008a2a53c572. 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/BRUAT1600013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe19b5cbb11184b3a9d44850afe6b660f1e7ab611462170ec4884a4ce8807f502. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/BRUAT1600014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84a57f98c0b95e8a92adce7011e9611f691a246f08aa219576f7cc1bc4503cf8. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/BRUAT1200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd66144b3900bfff89017947df0fcb28b96c6377c42dc847629c6c2bbbd8c8ea8. 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/BC9C12400030.