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 0x260b57dcfc1307e4d207e2b06b8f655ca7f5dee96aebd2ba33db84b25b952645. 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/11a15a96-b080-4e7a-8ed4-c1de72bb0d79.json and https://artists.proofprofile.net/proofs/artist/11a15a96-b080-4e7a-8ed4-c1de72bb0d79.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 0xc31949f1c5d8900f69c20869880d7a695e550a0b75bed4d3c605249a760f3695. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHN42579029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80bff1f0307fd28d6565b8bea994881729df731a81bee4bf6a8811e489444fc. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/QZHN42579030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce573552c5d5e769acd9c6f12fcd425de3372521267cdb1ad1335e2d5a93f3f7. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/QZHN72513869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x747a4ee91fdb9fa2731526f129cb08ab27bce79f590e01ea7a540f62db4c8914. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZHN72513870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bcd353faa9aa8458ffbc9da863ac2e11d7d1d4c2a1de5da3b07ed8121e76cc0. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QZHN72513871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d0bdc7ccf8d3b2d4dbcea24ea0f511c2a58e60498e7cd6f450756ad2ac8e6f5. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZHNA2526867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09e9f3c69669cc3eac79ecb3f1a1dac5bae12fdb76886017b87a0ee5c2c468a9. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZHNA2526869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb664d649b03d108c2d95daf65758598d9ea47df374116aa5397ad4e6af1cfa55. Chain 2 (Bitcoin): anchored in block 958498 (2026-07-18T04:54:58Z), 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/QZHNA2526870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd46f0fbea9ff75b7e4d814bf703d28f3cd1dcc309a04e64fa8d29ecbdf36e69. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZHNC2544620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x938613e0b1136eb0d9e53aaa71d36ec3ea1f80e5de9c6d41e038c0b371d1fefd. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/QZHNC2544622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc89dc1fc052bc26d675a265d7b45bb950b71a0d5480f22767d0c9791245c1aab. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/QZHNC2544623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6341388c117457d1bf6906b1bcc904c9885e239a393f892124503d2c8d5d050e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHNC2544624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ec8c894b4b76ece0a3d268730d703df41dc627ed43597d1b6a36a0cfc85cdc2. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZTB42500935.