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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x373f411a2773a2270383c4a5dd5b3411dd965ba578471d97bb5703e83defc257. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a9ef066f-7ac9-47b7-88bb-dd56ced51bef.json and https://artists.proofprofile.net/proofs/artist/a9ef066f-7ac9-47b7-88bb-dd56ced51bef.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb7d05c338f990371a5483c79ef39f1d6d4f104de667eea46dabc67604ce2044. 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/USHM22062970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13e11e1c9efe77751947b45288df7eeb957c17d104942c2dc6d20e3e7477f9eb. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USHM22062971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2caf22546035ead16ff50d40e17589e123d280122620aed44b0211d847cbddbc. 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/USHM22062972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a5fc68614484f31e2cf07de5b99a6e733c4fc0de6ae971373197a98a37053e2. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USHM22062973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a641710ef76dc2e960cd3395f0e366043daa7dfdfcef58e5afbabd9c452fe48. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-21T21:25:20Z), 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/USHM22062974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a280c62eb5829a450a4abf146f6280576d5e66ae46b72a86602a509128ef2b5. 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/USHM22062975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x882eaea3044bcd35412b2e80f6f6bfa16e74572aefeae44fd12a9d01d1448650. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/USHM22062976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcda4aa5a2fc89307508b6e44c80dd3467634eb8a8ab9ba9653bcc64ea20b8590. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USHM22062977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c9e1fd7a179bf2f573f55ff446a4befddc7e0ebc8a8cc3207e7710066112e2c. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/USHM22062978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49dc2982fb55f8ee9f8a29b581f6848604315586c1357cbdf81eb57a028c5c03. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/USHM22062979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36bbb80b45c381754f70195c9f032fd836b33be7debee411ae01a722fa74ca3d. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/USHM22062980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6ae2060f56ac131f0ff4f70258214de0d8596764d617185c2f4517bc1fe67e8. 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/USHM22062981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb761c994f04b05c6cdcb78caa2ea7438119fa527b527bc5f283254e3e44c7725. 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/USHM22062983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6d475854d87eb66658a5e064dd7ed961a7c140727e21060832743ac15c6ceb7. 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/USHM22062984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43d293a0c8a8d791463cbed31b558d5b050f3a6fdfb0a8770e8a39a47d851155. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USHM22062985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71ff9b13182f923dd93c11f5e08b0d5b1b7adf013668d92a27139b7fd1dedefd. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/USHM22062986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabf2bdef7480eb86cc3ce2b03e66e93f9d2270522f9bbd0ef5ad60aa007df785. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:04:44Z), 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/USHM22062982.
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