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 0x46b4a8f09edf371d72169a6b09576867f9f713361859ebadc52d405aa71a1d27. Chain 2 (Bitcoin): anchored in block 953596 (2026-06-14T06:21:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0c1b3782-613f-443f-84f2-8b536e408638.json and https://artists.proofprofile.net/proofs/artist/0c1b3782-613f-443f-84f2-8b536e408638.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 0x08a063a66c8fb75e1460fe5c13d6283d28823a9c2bc55df7dd4925587be682b4. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/QZWFK2435356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b8c0a511afbec7a25fd7c1d8cd6e762ed273de5feb054a9d3802471e674c5a7. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZWFK2435357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc34ea96779502613d21a537ccf8d42ef9a700c163dc2d52077075b947ddf2fb6. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZWFK2435358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a2c91f2bf434fb230114854cfbd0acdefa533cf64f3034a6aa6e962b8c400e9. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZWFK2435359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb95ccd72f7561fe9ac219ddc1ff1ea01f1870ac15656c3bd18ef43924fe7fff5. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZWFK2435360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdff95b6eaa9e5b30b522e362ffce08de57a14c6bdd166b0bc544034252d977f0. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZWFK2435361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c720a87f4450ad909f9fc27b027b0b18447efdf2d5f36b6ccfd0021685c0593. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZWFK2435362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77843ab8b85d7bb06a73323176dc7a5785a2bdb8ae334ffa2c5e985e1ba65b54. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZWFK2435363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cc5fdf136ccc071e934b41c890f54e6f827c4baa5a38a25b0954a6d8f847b13. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZWFK2435364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd37815e5dfe635243c024082810083de3a8e53a9c2c1d3207492f149bc612a6f. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZWFK2435365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e033cf4a9f5b2372d09da039d0cb30a16a99172ef8d2ace4b506a930a847aba. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZWFK2435366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05ce976037d1a5b60908f8b38ba1414a5912df4e17357dded1fb578028c217bb. 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/QZWFK2435367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf857cdbe37cf09562441236ebb9729d7d6cbaf117c5468de91fd24bb89893a37. 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/QZZ7S2490994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbebd6fa9071bbe7cdfd9b2f7ec8f9d79a0d8928a393eeaacd24362b3992d2ce7. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-21T21:45:32Z), 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/QT3F22491751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcab6b8d8f237dbde8587703d757c0fed81ba7be500332ea8447a6fb5fb7b20ec. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZDA62523678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5fadf3a693840c3bd530a1308a0f568ccf4c35098feedf9f178420f4d41be16. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZDA62514371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5765e36b32c51cea60023f82ac6edd1199e67588da3d04b6692409b1ac19fb6. 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/QZTB42592292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad8f33de39cea3e51c687b1b68b8ea086d223666e857dffe7b01f4056210f284. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZTB42594666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbad5250345d5deb291004ce8dd3946e0d089f7d3773ac2e6a1f92f8ee4cdee90. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZTB42594754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x578f2de597ff9d0a9bc142ec1853ffe803d4215ac5a4e8f114258bc33006c72b. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZTB42594769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8de6c279780c9e232c44cf23df678a4daa09dca687a0076b507658a868f74e62. 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/QZTB42594776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf49199515419b94fe56a34bdcf0e9f5b221b9eba2d51632116dd5d1cb86d7157. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QT3F42575669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4fc23124d517232985d293b8f8d05408653dfd4db9b1309fe14369bb87e8c0c. 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/QT3F32592892.