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 0x5769c6628b99a52730231849b1e8aa17bf481b8fcb596f52c01e18ecc74ef942. 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/b322de00-5a8f-4e9e-846f-f8672511df41.json and https://artists.proofprofile.net/proofs/artist/b322de00-5a8f-4e9e-846f-f8672511df41.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 0xa9e96c234978890ec53f90c1433c07fc66621ff1acd3e2f9fcde00c990769fd7. 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/QZFZ52118231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93b9650cb1d74f6d92517a31e8a9d3477211a48f457529103a57277ebe52a553. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZFZ72185376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5201ef87291fb485bb2e760dbc8162f368f4c63c401a8cc60f7ec6cc15dfaa47. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZHNB2167564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d6487a0782b434a4885df026156769882a235fbb399e207255531f01de8882a. 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/QZK6F2170619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x289b3613803c3dce96cc3bb5f0508352ac326fc91a0fab0a47b17c34bd4ba5e8. Chain 2 (Bitcoin): anchored in block 958086 (2026-07-15T02:55:47Z), 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/QZNWU2158154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf50dabf55549f55a84d7c57e859a0281d53f4eb1c2aefd53b11cd80d5f531062. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/QZPLS2190546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x845db85f366b17f41209db40dd13032c4168869020f7bea0f7dd8aedafd956b6. 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/QZDA42230383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73caec80daca9bc6a341f579bc62128fbc060abd190dc8e02dcf8d5d4b9fbb7a. 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/QZDA82208889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92c2f7615639e3877f732d0d045058f507af627f1cab653966354858313ae743. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZES62258937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc01d4580bbc21e9163c70c1b7b475080e9863c525e71ecd5ef016cb04b16addf. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZES62258938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe443d6d9dca1019c4855ca5abd08e1b5699a850556cf6b6ecd1448cf6ca55bfc. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZES62258939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf95e81799702edc612b3e534c4a9b0245e8c0a7b503a48866ddc38aebcb9bfa. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZES62258940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19dad01eba39b6e92364b55bd5f2282e81e47e8f2ae32901ba6c68090f5f6812. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/QZK6J2273911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73431d266a3237b5711856a706f6c314bc31dd3730bc5cf71a8c2578c8500358. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZK6F2278487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7352ab1c46a2cdd4e41ef7a916361bec0f892b83513563c9e1df2b17b06fb228. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/QZMEQ2259607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0627b33576a77b7ff911a0c79d0457156ca48030b45ae859605347bb10ee3b3. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZNWY2290459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x891cc9e551dfc777e53770318cfed0d8b80c05a594d5edbe0d4fed0390a2a498. 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/QZTAU2276190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1275912bdc9cfec3476844db280b24356e56e9bb176b508d4cdee5e59241f816. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZTAZ2267700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91b9afa3c022bf525bae5845e901656abc00d807532a8db157496a005aa71387. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZTAZ2267701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d29cdbd3c6b6fafdec657377449fab446f3aa5ca591418e4623e02ffbdc442f. 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/QZTBB2204462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13e3d887e8dbd970da11a21ef8670171ba0d7a8c493774bf7a0f97cb50575bd7. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZNWU2360605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab495bcc8bf28dce6255719e9ec5d3b2e0aa399353b2d7471681268ea79ccc4c. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/QZNWW2339843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc64c8e48e81f013a543c38ef8b15e776239fffa05e002f61171d6a77ab570659. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZNWW2384623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4087830f8265262010ea3598adca805fb2feb92faf45b6f87f730a3dac769458. 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/QZPLR2302316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dda02293d72c0ea9d8fe0fc08534f02fec8844e41887bc6b42a409d387c85e6. 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/NLCK42220358.