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 0x1ab91416583da349e41a963dc70405b26d9471556defb3b835ab08e67668364e. 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/37016ce7-98ac-4145-8c61-950ad706fc56.json and https://artists.proofprofile.net/proofs/artist/37016ce7-98ac-4145-8c61-950ad706fc56.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 0x7eb7be07e2334f5768ca8760add4ee66f7f3480bb237f77a53466fde356f9946. 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/QZYHM2424843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e4d47f2e76a7b8a9e13dd7914d2a1e082c145ffeb5934d2bb9a943c2f905fe. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T18:58:35Z), 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/QZYHM2424798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d4d3562333116eddfc69d48b77c24d424e8c975ee94b1b638f2ca468e599717. 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/QZYHM2424784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa667d845412713258c256e544ebfa5a8adf8d2f9357e71228e025e2ee8fb6c85. 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/QZYHM2422874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04d9039a084e84b6b66eafb6ba0a3753883aeeac3155670a80b25edf194a9d44. 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/QZYHM2422626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb57948af6a8bc6b662106a157331df809621102852df729a9bfa9203d8c1e304. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZYHM2417431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a63d677b2bfe1451eead0a5ac63319ecf10fc84cfc0ae85fc07fe19ecc2111. 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/QZYHM2416597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e1faa05062205b759e9c84f78b8f3196bb8ca332b5827a4e9f142e2f3df0a5. 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/QZYHM2414157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f27ab728f8f803c5ee59b84af1b9d3ae9d0a7bd7daf19575fb8a0c800a3d3b. 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/QZYHM2413044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb55564dbdedb020a275915fd4a66fabea826fda8bf5131a0f94e932e2b989eb. 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/QZYHM2413045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x537fb5cb8b79fa3a77d4907b68b831fc262dbd55c227fd734e2d0d942125bdad. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZYHM2411773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb8933288cacd40258919a1463048fd9e674b04a686f858361a2b354a77bb6a5. 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/QZYHM2410061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d3075e25870c404d134b083a77facc3c461f36a9c384bbc75965f89f8c2dab. 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/QZYHM2500753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e55efd3e7d9f7da22b78963401e58f4ff8885a204cb25d64246eded796e683c. 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/QZYHM2500670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x595569dc8df95c1c613f082abcc9952f84b2589ccc2693cb35b308a36e14d0a8. 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/QZYHM2429433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f04e1148abc147460dec4fa4503215696b3c931b787958dc2c607943de31167. 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/QZYHM2429231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13d41fc60f0adf123596d1830d4d10225e237388f9ed4c3b3169b8ae44fe49f1. 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/QZYHM2427796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0c6113f981202c3138ac7166b9d2fb440752776135bb6ecf6abca6f52e5a254. 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/QZYHM2427146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcd97619a039ebe72a47e2f562449d254510191cdedd1e0df7808bc543364a52. 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/QZYHM2425598.