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 0xa03604868452b414231f164e4cef7335682d6fc914c4a466a7566bd8d748a3ef. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/18eaca0e-6195-475e-9e33-68cbb0458282.json and https://artists.proofprofile.net/proofs/artist/18eaca0e-6195-475e-9e33-68cbb0458282.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 0x49cc6a80a2b168564e7e72c6c46b1207109d8536160aa41f29ba5804b0c0a4d3. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/GBLFP2427717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7105e8d93e286cce5ea8f71574ff92ab854def6a8e12a1c0eeb2086a746489ac. 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/UKXN22463286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d7a5f9758f4adaddd1e6868ea42488c2ace332022fec8c985ef57d9c005589d. 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/UKXN22463287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b1e900f84671183bc70abc41199a2d7f73edb6ae25b28a593f724290d794d2a. 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/UKXN22463288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1801485b96e02c51c8a3c1752ed5d743418c12275733d31d79bcc678b8de3bc. 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/UKXN22463289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce2320bb5275906b890998618ebdd9bf2f169b5ecc898868114ace4636d4c3d0. 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/UKXN22463290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcce607cc401f592626ceaecaa0a1bb7e0b566f5f459a38a0582b02c6aa1e7107. 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/UKXN22463291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbfc9637497c94afb44b182142d224032fa8327d58c92570ed421aea6e94853a. 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/UKXN22463292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eec65a4d7a1b0f7f553acfb438955a79d86a725a8eb194605fa1e1dd44ed73b. 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/UKXN22463293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff2ccd134eb149d34e7539f7491ac0682b186f8b1514480da03ad2a5130fd914. 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/UKXN22463294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e6bfb3f80ab591aba94af3ed4b758cfc4488bcdd9fc66535c51d5f24d01e2c. 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/UKXN22463295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39732aa4fd19330495c6d05ee2e9ea50c1e097bc93ab399404fe098eaa1e4408. 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/UKXN22463296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f8cea92f7729d61f6abfda7b20a6addb5f6627720aacd3aca08376c2055ec49. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/UKXN22463297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7324e4a462acf71c28f32daa9c6f4e68c91ba7d1a6cdd1391ee6ab65efee100. 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/UKXN22463298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf291b76e06700ea1cf1d211869a74cb60f6e0c6fda41d55186c5b12f240d0e39. 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/UKXN22463299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43ae1c31d3188078177a6e91a33cff7ba4c62210c22d972f244e0073f05b8e82. 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/UKXN22463300.