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 0x3d16b93a8babdbae257f432964c5418b62e20aadcf65b14c1d3cb04d6c0b6596. 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/6d828af6-36b5-4b46-8c4b-4e7a973a9dbc.json and https://artists.proofprofile.net/proofs/artist/6d828af6-36b5-4b46-8c4b-4e7a973a9dbc.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 0x4f0da3ba6bc6a5166b9e33041a0c8bff9df22ac35a0c889465c82205f7409ce9. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/ITXDW1600029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c3dd1739702686cb420f52cfe09cd756b6cd49e5bfaa50b23e2366dbde7116e. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/ITXDW1600033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x480714166864c1df5c30126f2784dc4cd6fde63073c6a1ca537cd97d10335477. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/ITXDW1600034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9f46e0d1ab4f8a9fb180b45e049c9df66c3a69ff618277f08cfce655a409c68. 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/ITXDW1600035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x936e2f2e9aa22e7df0cc0ca7fadb8d6824469a6d47a80bd353d5641058dd0f14. 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/ITXDW1600036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4906759c0bee1fd5bd2cc3669382432ded46cef70e5423ad554d3e19a2bbdae. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/ITXDW1600138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b11e12becfc86d462f00d33a5458389e68e61788dc84489317c4f796d3da7fc. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/ITXDW1900204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1b18f1d01c0b8fcb9deb07727c1f66e518280aff25dd9a9913fbc55d2b524f3. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/ITXDW1900211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe32cae4fd02bea46f063767520e1948ca468d4785f2fab17b54bc90dd6db6a3. 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/ITXDW1900212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa97b63cf67cc81ef08d2784b0a2f971e0c10c781582e23d5118a6c77bb0cba9d. 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/ITXDW1900213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee055d603499759d6cc1f76f19461cdf7029e9dae277c9f529333d1a4f1d9c7a. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/FRS182044181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2277fa7a257ebb94b4368292e8618f0f81635676cc07df6c5121784ff333255. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/FR26V2031057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57b3aa78b669e1658b013f4d2924106fce6c0d3bd7393813fd2e7a491fd66f13. 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/FR26V2031061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb8bad03104e68425651157c2dfa4a9181c47e056690032428013c7c231f1cbb. 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/FR96X2160851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x378fb09966bf020ae80a45e6649da7d3c1c82be83b47a178796849c0a91f739b. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/FR96X2190202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc726e4f9eafd94edf44d3136abc50528ad3fd10ca93d563b82e40c3947723af. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/FR2X42225340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x064e7cd005846332bd57f2cd54e839251858f1d98b9cd3eed8755c8f3971ebf8. 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/ITXDW1600136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c9f53e7f40fe72da00bd41666ffe03cc6e43e1a0625f4b34dedbc4bd07cc3cb. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/FRPHM1700110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10eb2947ac9d1c589e3f0950d574edc23e0fd46e7ee12f6051bf2fd7872e2cbd. 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/FR10S1680606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f0da3ba6bc6a5166b9e33041a0c8bff9df22ac35a0c889465c82205f7409ce9. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/ITXDW1600029.