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 0xe531ebda5f71ed8583ab132576c7cbde95003d6c8977369232367f24af63595c. 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/5e1a69a7-1558-40ac-ba32-43c9f3326f49.json and https://artists.proofprofile.net/proofs/artist/5e1a69a7-1558-40ac-ba32-43c9f3326f49.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 0xd0f899877fa27b0e4ef139fad89db9240c5ad266aa9da3721196cee829191d4b. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/US83Z2406142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x123b61658a338517c1d67fc32b912492e2c7d952e3e5edf20aa785e1f0eac331. Chain 2 (Bitcoin): anchored in block 957591 (2026-07-11T17:21:30Z), 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/US83Z2407877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbfaef83f04417dfee8f8dc9dafb5a386c4d03c8a1543db4fa54d62685121b07. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/US83Z2407876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4162dc719b4022bd794adb6522cdc7685e22f210a724e2946277f9bdc324c6a. 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/US83Z2407875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x952c61e2a25f61b62c47ceb09f809911279a76b8a17a55c40402b897949c4c63. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/US83Z2407878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7a9f33744b49c1f0b00aaa67cb29e9507436a15495d2f91c68496623a650694. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/US83Z2406155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef75258e4f536688df5a5e9f05f192a0c1d0fc068495409b0c69a04559169e66. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/US83Z2406150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda30b5cab964f9cff988cd30fda7fc3f4f86762cb430c0382fbf5dfa6ddd235e. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/US83Z2406153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2316f09be94dc8b2ce92b78e37ab48be18cffe37cdfe4e9dc4c54aa0dd636346. 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/US83Z2406154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f101a37873c2b30be10c58e85e97dae008c474fb46e34005c804c45741c3623. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/US83Z2417142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf869b1f32ef4eb28419a379407629a1336a917bc0d6033920dea41dd4c3f4933. 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/US83Z2419626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca562fe2533f09025b061d06d1ea32e8bf3eccbc3a04720e6536dba63c7ffb2c. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/US83Z2406156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe774f627a01747196830a859892fc31f8334caf41b094a3b6712d33e820903fb. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/US83Z2417144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb77457d070f944b3e3af1693b694be39779f3cebdf6aeb4b3b9c20b8aa047758. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/US83Z2417146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fc13936f997b997e657cf2e22e22cb036f41c6cea352860764e52429cabb47b. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/US83Z2417148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa090d797a466c5596194834b4ffe4f4b606fa05700c50b7874029e785b724309. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/US83Z2425784.