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 0x2de35c2acafaba809af90b8eca81f61fe4109325a1217a504c4b4f7c5cd7b685. 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/792a6bf9-800e-4d49-aefe-787cadbed6ac.json and https://artists.proofprofile.net/proofs/artist/792a6bf9-800e-4d49-aefe-787cadbed6ac.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 0x249a3877674f80e54c7c60b2628fc16909fdbce53bdeec3567edf23745b947f7. 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/QM4DW1787855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d1f7f904a9be78d98b97d2b4208afeb6afc99481012e314c9bea195599c0b92. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/QZANL1714444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dd161f3b9cfa3cec617a19db580915e549ff6b534ae9628b1163abf6f1598ed. 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/QZANL1769038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcb8e4745486eb92717e1ff5f963572636d6a0e1c0804aa5a42af0a8a1e0554e. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZARB1830924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c5793e4c477e7300e0dd39aef37e0e1a47c1d5b93f229e963d17e2b96535e7a. 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/QM24S1830694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceb04a3872c8b7a35a75194a47c546c04dd9c39c7c76a89d2be4ec89543c60b9. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QM24S1830697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c6e3b48d95d2b25a5436fae2819fc9491a9fe4a3d6013f4c418515569214ca2. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/QM24S1830699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8fde77c3dcb4194ad5a2d42bba170c7910043ceb20dc6bea582e4e811bfb54. 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/QM24S1914907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7d54abce549955b050a1643d50a4b9d8269ed82ac247c9d1a6bfe39323adcc8. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QZES52073578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d12164f29b9a5a6151654b81cdb2e201f2e6fbadfed0de4d20ee2122f1f5283. 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/QZHN32359626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b48139b8d58e78a439ec50d6c385653bbb8b2a027aafe2276596b5c67c1f8c9. 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/QZHN62301291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c71c85f916d5e7d4eb3d531bd4af1d639b1035494f5c214b2f1f68b85fa124d. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZHN62301293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46cd11e0f1e8d5f0aa46f8984655b6e4d01bbc29072b939cfdff43dbef7150f5. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZHN62301294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe72923a9955813f4f62e412308c2f71da8c48a49030c0cfa6bfe64fa5439ed7. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZHN62301295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3ad076531fbdb23c4fbf07b95776c7c2b36f92391104a4a9a3d62b57c0fc065. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZHN42451697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe96ac7785f5bc846496758c78f624ad68b98fe2a71ba7ba78b93604045c20f. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZK6L2490934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf114646009041783501cc7863afac2772c7faca61e50cb2843e1dc4c210761a2. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZTAS2453005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe724f4bbf8206ff09cba8ccc7e21fcee79a594c5994e1df3667f3c517bec54e8. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZNWR2431805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c4bc7d4e59a2537145de2c35f8a6089e7bd62fb2051bc95435994cb251dabe8. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GX2Y42200035.