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 0x88251fca302cffef859de17298addacc31eb0c43ddc7f4e3592b217da1ba5825. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a8f26e3f-b929-4c67-be1b-52f672545fcb.json and https://artists.proofprofile.net/proofs/artist/a8f26e3f-b929-4c67-be1b-52f672545fcb.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 0xd42cfdf2cfb64528db30b09140e6b20fe80e7445daf4686e371ce014ececa8c1. 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/NLG422400383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a026ad940d18baa67112a4439c2fee02ca4aad73414182a3d9c44b9df1e79e1. 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/NLG422300296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c5d956eda66812788a6fd90501d21e91af89b9c34291eff978ac179efb5f251. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/NLG422300233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b0743b5efcca71be63b527ac68eccc81680adae05b5eeb48c8804948fc0b0d4. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLG422300234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad7f7e36509259293a1bdb65b0ee4c27cc3713cc3bde53ea43d7da8a32e956e1. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/NLG422100037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba682cad04f72fa156a1efd1db51684f36be4616193778fc0de23d87d7aa127a. 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/NLG422100038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe84a4c2bb6666c8baf771467b6a2bf02ae2db9a911668dbddec0f0c8ba9a0499. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/NLG422100026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6d551a5cd155d393231162470692f218f000be8fed2b99733b7551969faa05a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/CHE211900092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x551a2d619a972eaa836e43a6224d00b917f794e813c973c8d4454fe9c5c3c80c. 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/CHE211900079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46ce002b8f959874116e988ca8a8d91821deefa86205643a56e745b524d4e0d5. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/GBLV62201572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120e4b60f6327471b15682121e2efbe1a6c5ab2aaa1d5138dc58424dc99084f2. 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/GBLV62201573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb946ae8a5685d69803b275652bcbdeaa77084452a5fb75f164c8d43c13606e0a. 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/GBLV62201580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x931405d37ca498c79053b9bfd03f3ccb5c96e6953d414a247dd0d4fca58b6ce1. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/NLG422200086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x963c8d10bed3a990f6764f3050c58403968201864a3da68a96584df733dde872. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLG421500042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09b1436f9ae94e3649b990d5249638189ccd21fa79f61ec127dee1f4d7f07c1e. 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/NLG421900079.