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 0xb614216dd8e2818ae7a0cadb9b923232d014cbdac9e72256cebcd32c63a8531e. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b2919bb0-994c-4bfe-acc8-6d4425ecbccb.json and https://artists.proofprofile.net/proofs/artist/b2919bb0-994c-4bfe-acc8-6d4425ecbccb.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 0x1b060189be805b2dfd91e1c79aed1f60dd27c62facbf680e5e4619cc37d14859. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/ES31E2408293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8100db29df409693d0c529dd15e2ff567bb6192ef69ea5f9a9541888e709db8. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ES31E2403720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5c5023ed6f23aad4b605bab761b62d7f64e9a23b1d1179b8b3a811847c32479. 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/UKXN22224099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa85f8c774c7d55bd7e628825205336a35c5d050a61c61e8edeb93b27dd587134. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/UKXN22224100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d1788f4bd1bc9eaaa1fe690571366b3f52347223eb76b59d246cf0fd0bfeb11. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/GBLFP2215428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60b5bf4a03f01e34eea2f96649b71a7775fc845d329a3fab4ef319fd0070aa1f. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/GBLFP2261043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f7d3f04f9967bd3dbf68d597ed456bcbb81785ff77e312b19d3c5a84af7e0fa. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/US6R21323546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3a9c7a0362480cfde7a9f53d5a16d806ee93c3af3fde1d6ce0feb76dd03dfbe. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/GBLFP2290902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38a12cf0270f49a14a16c30d3ad4deaca2b89fb95862d6271039a984f9941ead. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/UKXN22224101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea5833937c0022010d707f97cfede4e242b253db7437c5f8cd79ae0fa51f5b09. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/ES31E2407456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61f886e9cdb1969df38a99a889eb1d56902fae85ce2d63e5382095d4290e3c4b. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/ES31E2407002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cd135886e3b45a309ff7d726aa95525ac5bbaf2fcc1037cc4f84a2cb262d3cc. 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/ES31E2404636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x766fe787ec133170e156e1926097c6b35f9c009d5b0fd51d346454186ccad266. 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/UKXN22327720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d224d34d778defe9aec6662d81591a7e9ec1ff29b8f2536853c3436c4754509. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GX3Q92351898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3a9c7a0362480cfde7a9f53d5a16d806ee93c3af3fde1d6ce0feb76dd03dfbe. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/GBLFP2290902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60b5bf4a03f01e34eea2f96649b71a7775fc845d329a3fab4ef319fd0070aa1f. Chain 2 (Bitcoin): anchored in block 960384 (2026-07-31T09:54:03Z), 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/GBLFP2261043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d1788f4bd1bc9eaaa1fe690571366b3f52347223eb76b59d246cf0fd0bfeb11. 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/GBLFP2215428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad8026263f20eb66b9e0ceb4bf4500f56f9a0c4b726f44b47c7630fb20aa977e. 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/ES8242071702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64714ea640f7bdd9b913f8c3b80c15e6fd33890528209979c35539bef4962554. 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/ES8242178501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fa3cca3e5483a4a3048f5f067933003e3ca44d708a915958893ccdeeb29484f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ES8241969601.