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 0x00bfd9f8009f17491e98f5697eb5144409c42c50956efc864653fd0734dd3049. 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/74cb6fa8-cc3e-4974-9a14-4e6f9f74bc2e.json and https://artists.proofprofile.net/proofs/artist/74cb6fa8-cc3e-4974-9a14-4e6f9f74bc2e.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 0xa0201e0c4f78d2e6f50713984e3763741fb31d8afeca0b90b00789e1831c9b1b. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/QZFZ72291252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a488bef6f8aa998e991bf1f53b26a36e7189a92b5c53357ae9132532d31164. 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/QZFZ72291257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1815d8856d5f23189412949145afd7131c917b700101c4010a324cc941907d0. 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/PLB231600038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb56f718dbfbfa3521d819e7a917dc882846a499969461756a1557423ebd69f6e. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/PLB231600040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x265a43f348b3261741f0e3a73f3f3af4c418ad6c0796db201d7dd1e73f516632. 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/PLB231600045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8621631fa5de744652864d15928f1c235b80ff42fb4291af9b214e2fdba42ccd. 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/PLB231700115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ccb5a1fc84b8ae2e76113b4bd8170a74608973849318f84298bec669194b5a3. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/PLB231700121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6da9d3699320935369eec562bec36a21fb461ff9899dae927580d663faa44057. 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/PLB231700128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4da1ffcb644c064e59edb89982050ceaf82eea73fc38035ec1daed66056223bd. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZNWS2204138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c249a32c75631e4c8b75c5b29473727c9232bea2c1839a2edd8e70c15329721. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZNWS2204139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f2f3ec3d5e06666e385058bbdf5210b050b86edb34c40b7ffbab8ae23515fc4. 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/QZNWS2204140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54c870820f57fac611cad45bf43663dc56d4bb48b8b6f99c6b0264d32f8631c7. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZNWS2204141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x605d2568a772a0f48b5c98508d7c6d1f086ae810665168e29f04d4d9692d78d9. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZNWS2204150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52ceaa14521edd2807e2da92b55547be36faf98741081282c017ab8e846f7aff. Chain 2 (Bitcoin): anchored in block 957697 (2026-07-12T11:22:18Z), 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/QZNWS2204153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d2412fed3f0c33d3f28a0939c00277580866fa82cf71f14fba46ea1982302a3. 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/QZTAZ2305120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x289084de59e5fbcb1a728c7b5b3d33b818c4418c5c8c547537d7af0dc412699b. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZK6L2481917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc5e468e1b8dbedd71349333fccd4198d94d48d8c217e0a16fb687653730242b. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZTBD2459370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22e11a1e79da54bc259326f1f8a5f18bd280d5fadf09a18a743db88c34330237. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZZ7X2510982.