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 0x3d3c80f688561aa4693d47c01c75f31de9070d6b2ed148e28540c63478bbe4a7. 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/e639c3c4-9a17-4964-b5b3-f1e9e8510b24.json and https://artists.proofprofile.net/proofs/artist/e639c3c4-9a17-4964-b5b3-f1e9e8510b24.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 0x2a17e0cd43506583c89a5d11c1cf6d4111528e9b1fc1e9841c862aa496eab7db. 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/USUYG1088121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x100dedaefada29ada4f18eff85ffba71e531ebee855b72cca31c334d7320827f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USUYG1088122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b1dd29ce746004adbebc37d5dee966216265459c734d04420e885b4e3c977e6. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/USUYG1088123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3573867eeb6d883f4054db2f0735cecb18b5a4856418a8a4d12d3469b58d191c. 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/USUYG1088124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b982ce967dabe27bf2440d8ac2965a61c81c39f35fc94a9b2daa62369bedd0e. 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/USUYG1088125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cb2c11f186d905649a7a0fc3eb6ff1da05a92c5e2dab8cc2bb0248db92b66c6. 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/USUYG1088126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5becfc51be3f635234cf5b9de17571280afdad408a191595a4e369893ac9dd0b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USUYG1088127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c9b7c17de29994df3db10fa4f4c2ebf8405742f9a74b53d6479a137dd4e66b5. 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/USUYG1088128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82f882569a2bf8a8c09df9c8ab2f1e435ca7a82bc2c30b1285bd00933191462a. 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/USUYG1088129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59364abca77a856ec5a522e6b257a69ba324e437f575391b0161ea00a040ef23. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/USUYG1088131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5cd5ba6d1a09abe952a397769bdf5c4aa0aba2b40fda9478002209b6661e221. 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/USUYG1088132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3dc43418c5d889bb78694499189df3c88f8666d103197730c7de6641c407771. 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/USUYG1088133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e393f464548e09fb000f146a86c65ed02eac551049773ac54bd505d2f1e6812. 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/USUYG1088134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0875f762bf3b4af0c426b094a61939bade0084b8f1d544c9d50155f5c5ac973d. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/USUYG1088135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a3bd2157e2d1237630d7a408933b457b819192325750d3c32378a59750587b5. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/USUYG1088136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x971eab28d1fab92c9183b91c462560c790748128a5503bb2b11bcc95709dbfac. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/USUYG1088137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd98e33315192b78b7a56431e06d8e1e45d3bbfaa1534ee0357db674ec409d6bb. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USUYG1088138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe4b2d9df91ceb4477122508331a1b5439b45d53b38e40236915d4770039e18d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USUYG1088139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b59f0c106ef1c0bbd8f6028236a5b7c9aceb86212aec7578a4d8059334b015f. 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/USUYG1088140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25248f0ea0932f73be3956b35fffc85431bb64159c534f0a0aa9c34e7f3cbfa3. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USUYG1088141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35c728afe837caff9bdd30a2edb9edf986b014a35f310856056f6c12227db8a1. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USUYG1088142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x894a1dfe9cc506bfce89f473bd7c6d3bad3cc445ea9a2b46a582ed3a6bb14af4. 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/USUYG1088143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fec91731eefda5efce56a3a451fce124c2cb12091e5bc166d6d74a57f892558. 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/USUYG1088193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41b212f16c1cd1f6a33ebf819078f289479f09957c168a387e1b37135cca3c65. Chain 2 (Bitcoin): anchored in block 957866 (2026-07-13T14:54:25Z), 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/USUYG1088197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28916ba7577843ef1751befafd6ea4f204b96ab87b2c29974d043fd511c9f5c3. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USUYG1088208.