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 0xc04f9cf50e23f972ad0cbcec6b1577bfe828ef0854f209fe61ef19ae4066b8d2. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/295d64ae-7390-4f69-83e5-ed845d210eeb.json and https://artists.proofprofile.net/proofs/artist/295d64ae-7390-4f69-83e5-ed845d210eeb.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 0x9ac0fd3eac9de8b757d8b51fa53e982e99f3c7071f451240894f48f387edc623. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ARVW52303558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05d3d5c1717a09f9194a85f3d12bf67fdf1cc16a245d8cad8446ad12210ca23c. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ARVW52303559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46c5900f94a87c75fac4356649a6fc6a487e0140328ff532484dde2780d0963f. 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/ARVW52303560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70dc8ba3885521810611cd0fa71d6647db853839aadc1428110ad47ecf3d0681. 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/ARVW52303561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde12ff8f688cef94cfe67fbf49c021f419f68547d67f8e22b2fbfe81c49c8eb8. 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/ARVW52303562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8105b18eab19e7237624aed9215390b06eece6e819eb74424e11cd2fff412475. 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/ARVW52303563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacdc361d1f819acd15b69d43c7bbf41857fc380ed83f98e39cbdff4505ff22cf. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ARVW52303564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ddb34b1ed768c82d00599d28551095f4b6b7ee4aa11870df796e8673d05600b. 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/ARVW52400185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06a548b5ba04655553bc315fb5ab1ae9932910a982226fd72327c0389d575214. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/ARVW52400186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19a3e4f5de8e789f5995459ad61c677a2d3b2fcb891d592915308c1d1688d9ad. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/ARVW52400187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x006dbfa4c822072ab2615711c77cb2491ad58f3aac482a994421602cba118a75. Chain 2 (Bitcoin): anchored in block 957776 (2026-07-13T00:05:10Z), 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/ARVW52400188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84245903c37681e08726644b568d530ab1737ac3b5dfefdf7fb00350551438c5. 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/ARVW52400189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19a3e4f5de8e789f5995459ad61c677a2d3b2fcb891d592915308c1d1688d9ad. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/ARVW52400187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x156cd7ded6ea71dcf82784e5cc3dfa8731be10ad79e866ad52dec01e6cb5b224. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/ARVW52400215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x006dbfa4c822072ab2615711c77cb2491ad58f3aac482a994421602cba118a75. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/ARVW52400188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84245903c37681e08726644b568d530ab1737ac3b5dfefdf7fb00350551438c5. 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/ARVW52400189.