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 0x0a327484b7eab3295d1c12249bbd553121143610911830f771dde826c9e56050. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5bf51a5c-6b8a-4728-a917-69b806dbe022.json and https://artists.proofprofile.net/proofs/artist/5bf51a5c-6b8a-4728-a917-69b806dbe022.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 0x2fdafe1c412fa8001430d15d1883126bc61ab0bfb4d0d30782dce3ab584ea711. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/US3DF2407085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0375c95dfb7bdcdd6208005c75a6dcd0d174ebb191c6cdf752b32b1738dd8c2. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QMANG2248584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ac992c687bf122ada58cb9c665aa4c52f7238fff39a4b510d3a0b10c14ef03. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QMANG2248583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50c078df848906d7f4cecc273d37815dc3b102b8d43b76edde8a93263334432b. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QMANG2248582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19a24254417d717c783656316c752e4f5acdb74c1d91b4b2fd28180d610d518d. 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/QMANG2248577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0610f74023e2f80ca3e8b73266d9c3d847b40b80d95439cd71111e5fdd634216. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QMANG2248576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4563542081e6cc65176536db9ac0d7ae4c5b79b111f1cc12c211c4c92faed63f. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/QM3DF2205616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x489ed58ce6359838f482b3d28669a7fcc1958bbaf5012ef356f5c0da94082370. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/USANG2296396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc6d8e5353f583568eae2b70f9ace5e6e710c16bf033ae0691d3169a79eeb3ce. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/USANG2296395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8384280e89c6bf12840c0693825b39726042793669f8ebd8a3e62b149649de67. 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/USANG2279376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9830eccb47c11c9d5bb58f59b836d15619dadc6dea78006588f2e2112910135. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/USANG2279375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9795f27c98c14142ba9900b772334c89e446a0e186d5cab75da948c88c514723. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USANG2279374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x960b7606a84735fa9f05fa915be8d16081f7ff1b419d76c31d97048c51d4767c. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/USANG2268925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb45646bf26a331378fc1b847b0272ed8d55469a0d58d2900fe05efcf40e4e37c. 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/USANG2268924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x579f7b13f696416546cfa3f7ede6174d46f88c22fda1a63da360c0ce3b378e42. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/USANG2268923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1007e7ab650da9ed69334291400a8bf7b43ed467b975e0554d71e7ef81edf0d2. 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/USANG2268922.