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 0x8c0d55ffb494d67f3eb6864a64943d9d148513b53a64142df439b0da61a616b9. 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/ae3a911b-5336-4c7f-ad25-ed01036a3836.json and https://artists.proofprofile.net/proofs/artist/ae3a911b-5336-4c7f-ad25-ed01036a3836.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 0xd3d25eae3db85de963555e53e77f8b263bbfeb9ef3be2361bde173a3be0ad5ed. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/US7VG2170307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b64dad9c46074aeb43345f9a7467c5084f49f47ce65e848da8b47dc64b3a1d1. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/US7VG2170309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d26aa960d1f776d1df811d9bf05ed51dd59be70118d26029df8bf6d062e3feb. 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/US7VG2170313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0914f786fccdfd073a6116e2f8dacae9eefbd5a730640ecedfbfb206b951cea3. 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/US7VG2170306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x762fce11700a5558f4bd1a814efa9f6c9c9f6697dcf8c145460223ecd7703f53. 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/US7VG2170315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x060f9217e0de87e1faaab38d7f2c5d4be4f52b82579dbb77018b8a98d0c35d6b. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/US7VG2170312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc13f07bfaeafc1986e8efc31e7c133827d937d7684b59abe195113ddb73c2fb1. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/US7VG2170316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ebb320f95b665c8dccce06cee2ebaf1cd2046d9f85aa51dbbe4d2f5cac74699. 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/US7VG2170318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f6cae210c6f3eb71af67ce5a32fa8b0692b1b914891adc318ef895225ba007d. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/US7VG2170314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2884e3f50f8e557d7c50239631787a16018474eb0e189c2e9c811a6dc932646d. 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/GB0491400144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1043d8b01d92f1b9c0a27f4d4efb92196bbeaca2de6c0f6061fc701be69d3b9. 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/GB0491400135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc54da2f96b5caf0749f5eae6439508b8927bc31f1dbd835303ec36b1de7e9c7a. 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/GB0491400137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ae5d75a24679dc16c70e7b01974066679f9f171103f921aa52f2d5ac44c3f4a. 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/GB0491400138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb1fab497c18c4f779e0afd0381c4b6102ceb026b7aff081a9c5174675bc3a1e. 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/GB0491400143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf442ebc38d63f5598732ad14b4ccd1fb8b5dea853f49f486b88f9483feeb0dc4. 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/GB0491400139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e6241f3eab15308d9bbd35e2b22cb2ecd57403a6eef3c9c5df2078352586799. 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/GB0491400142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc97a2960d852c8fdc315a093fa6ac5753567cdf5b7a0affb758c91bfe1e9141. 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/QM4TX1838086.