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 0xf3eddcb046bae90a156d1fddbda471b6defb14eeb1949b818cd92489c88f8ea5. 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/26b5aff6-a22d-4818-83cc-90a1ba470568.json and https://artists.proofprofile.net/proofs/artist/26b5aff6-a22d-4818-83cc-90a1ba470568.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 0xc83987e937ca0e3c407433200513f0895caaaf307748d2fb8ba28dac15c6bd85. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/UKW3Z2302404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcda08439ebdd70249fdbd3a994dbfdc99cb7e59474181200f2055570d289cee7. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZK6J2324123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf253031df96455111c9ead8215cb627f95f3a7ff2e375ae85868adbd9a30716f. 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/UKW3Z2302405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb8db386c5f8e7005fd884b7854b64e1303b9d7f9c6f19f3357e348ed651768d. 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/UKW3Z2302408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1386c5e4e7791ea297e0e9d6809d6090fd44dab78724f8060fcb0f8e6a5d485f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/UKW3Z2400490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7889d85617afed893c56d758b9ed6120abce3481a2f426d349686108b51865e. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/UKW3Z2404646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9f4a988815a3ee72f1d5e95102e9446b5d4d13736009ec2213a1c7074cda27a. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/UKW3Z2404647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fee6914b924622c1cb817b6653d7ebd5ffe6f0ba8a04d1a734188ef6869d249. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/UKW3Z2404648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fc57b59c6b121db0afa0c62407602ada90a3a8c8ef17c7cdce33761babccd1f. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/UKW3Z2501583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4a9ccd34af3e98a965d112a603e898076f6e0e982d61e62ea50835f5bc93461. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/UKW3Z2500991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb258b6b83e35134487a0d1c3794147be002ac798b38bd0a2de5452a196e9d114. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/UKW3Z2500844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d99a28d9fd8e5ae91b247c93472bd1dcbff7efe7c2e5317398113875109062c. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/UKW3Z2502137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ebe2163a5cecdce3d3c0ae6255aa7bf144fb8d3b57e600fd98cfa9d728a3516. 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/UKW3Z2402974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf18793e79654d17f7938afc6bedf298d76bc6cd49af852ca26236a12671fda47. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/UKW3Z2404103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79e14dabcad0d6c64ce15907bef25779c17c0acf0ecf0a50d931d63ebf8d25e6. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/UKW3Z2403411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1aa21741c4bc55acaedd78520e217415709c106328d093fd83ea361891c70dd. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/UKW3Z2502179.