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 0xe540a552fc6ef81d35077d29250fb570a2b86cc6f697344f6e093753014a599d. 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/ac69a4f7-65a2-443a-b5c8-9b282b89e08f.json and https://artists.proofprofile.net/proofs/artist/ac69a4f7-65a2-443a-b5c8-9b282b89e08f.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 0x06a9136881de8defc519737da31c9c1c6a8b0aaff2b8313e313e2ddba9867967. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZK6G2074120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeebde6214bbd454b125705da1e2eea4015010644bda98436bf790e29e09f64d6. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZRP42258792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38af6d2244207eb0f5de4d22b7f273b931908368af1816b5dd0f36942a63b2c3. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZRP42258793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x133dda5dc67c85b67c0b22940355c1702c2f1c7c299b304b46906fa1cb3f649e. 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/QZHN82195704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ff116cda6c13daf0d8ed6589b0b74d35d9c7787be2a5a6f017c36a2dd597b75. 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/QZRP42258796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x330c8bca27a2d22c847ee0332e399e11c259d0f54d583095d159d99ac79840cf. 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/QZHNA2419302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb465de40949b8b89d8c36216841e385d1f2c4927b2c06a85f48501b5807dd408. 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/QZPLS2470117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x588af4484857e717da8d8b64317aa5de72e3689d080be37c2bbb121e48025caa. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZWFW2406090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x085fdb0ffe73b3d2370c1763bb6adc0d1e81782aaf7dbd0d1ccafeff34b5cea3. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/QZWFW2406091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff58c9a36f947128f8431a650266dfe001eeb32494989bccc6c610db00aa783d. 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/QZZ792443948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f89e1dd5dcccb2c3d39eb58b025528a089acdb18c39772274ba5b1777f42f9b. 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/QZZ792443949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79ef8cc21530f3b3c67656849bab10c0f9acd7bc0c7409b40bacb6a5a77ced1c. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/ZAC012501246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34d352a6d65af2162cb5c6dc852b03c466ca526e37bebdc26fc8fb7d24e8792f. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/ZAC012501247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaee630f8bbc71fce30498eb98ed905b88699e80c21a1ac2dab546c7ef28209e6. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/ZAC012501248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c0bd38f9383a71a78b98b2dcbeb67bbf2c493b8addaa91d079fa5a5b092320c. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ZAC012501249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49ed99efc3a2129b18076c73a065ea95f058bb82fe06752d8c6c079a5414a835. 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/ZAC012501250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3aab36a5aa52ccdf95c7cc6bc1472ef7c29fcf95ebb20d3c916fc901cc94683. 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/ZAC012501251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6bf6d1bb0556fd640322c9eb07cbb199b49107ef686cad5c76dea77df0422df. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/ZAC012501252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d5d162945b503b3ade5a03dd27d4618dbecca4839d47de27b91b5ef58b49b0e. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/ZAC012501254.