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 0x7d57013fdc23459d71891c7153e437cdadd58cfc5819921c54e279533f44c03d. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e1e60baa-cc41-46b3-90db-b1d3a16c54ce.json and https://artists.proofprofile.net/proofs/artist/e1e60baa-cc41-46b3-90db-b1d3a16c54ce.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 0xb9ff37f2a84110d2a9c208796be7dbf3f901759bd9f74b0b531be990ee682741. 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/QZGLS2473574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0199f98f45752a78a44ec46144b2b234e4dd298bf4f0771bf36a78c68fa5393. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZGLM2485007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc12ec5bd04ceb73d4e05a928c3d7be52d1bb2a69a87f1e41d171250ed6ff1663. 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/QZGLM2470045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb20ea90acf523e13d4fa2fbdee7fa9b277c6a1f3a47b8d3235ee3be11002f7ca. 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/QZGLM2469851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c022f2e8317b4e8026b5f43c700883cc6bc22c72a17f49cd194d26df43a3ed1. 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/QZGLM2469952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66d0a38c84425062a63d31dab99cd50efe25c4f0f406a0357d1d106e92ec7c21. 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/QZGLM2469973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd6322e569e668ebb8e4bb946f7f34fc889dffca71a7c396baafcdaf86ccd054. 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/QZGLM2469836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70885d9911bdc50b729c6e2b4712fe768570ad37e0ad9d8046c29a4b2c49c660. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZGLM2469965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb531db6aa50329d1b1edf6d6e68b11ac68911039a5ae55d7c737111c8c7c71a. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZGLM2470001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5cc0d3da77614fb1b3af438fe25c1d4638c6474444241d6afcbc05519e4ebd8. 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/QZFZ22428270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60857af7309606132dab2247999b1cb6dc96e1105c6919340f4ac3de40ab716a. 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/US7VG2402412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2df356564352a4e166dc59087582a815435905c3c74d8c4308d4eff93af4c07. 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/QZMZ92355936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a14b146ce99502e046476fa26b2c209457334d5460bc112de48b7a36d904449. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZMZ92355937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x812feace716ab8f10a02a88d1cfd5a9274989051a482543959aa829977f04927. 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/QZMZ92355938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e7322048dffa73631c55a5aee4a091a7bb2fbd958e0ad34425fa7e084951d8d. 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/QZS642103321.