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 0xde6c19223bb5a3cd73fe5a80ca6a6bafa8c5e405b115f4fb19c1f9f97f39958b. 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/2c422dbe-764b-494f-bc4a-0e21c7a47f7d.json and https://artists.proofprofile.net/proofs/artist/2c422dbe-764b-494f-bc4a-0e21c7a47f7d.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 0xc75dde2940ff42d093cf71b51396a87fb8afb2fb736258df18d8805e92b692ad. 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/CZA231700432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21a7b45d2673dbf0849686e490eadf3b94a467fb48febdf9ab3cf01f6cc3ecb9. Chain 2 (Bitcoin): anchored in block 957876 (2026-07-13T16:00:32Z), 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/CZA231700431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5487420da2bd389265c92af7474e4dff3a34937209a0577135f04bbc5de1a4d7. 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/CZA232200177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13d94d7a0bfb45adb2352cce7b21d5bd2f8f96611fb873859b5b92a7e25661a2. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/CZBW92200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe09933fd2281fe56cafcc215395d4865b109b4d8a45177e65510368d4fbe040d. 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/CZBW92200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5561efaea437403d6682cd85ae831d74371aa3846e64627ab1991124e1962792. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/CZBW92200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb379f641b8eeb174df4e86f12792774a295ab7d6e37d585c1c63a7322c306d03. 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/CZBW92200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aca860298eaeda46655a21a6f13eccea7756dc486371256cc98c3ba76b0cbdc. 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/CZBW92200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcb3f43ff6e36ae6094674e9d7437f7a62f70506bdc77f378c85a80971fc7429. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/CZBW92200012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebf3c288fdd461bec49c1a9596edf366e7e5268aa97b0193650491857788f4a2. 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/CZJ662200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7af9d485edd51dcc72b7dc69ca7623ef1025688ce7a2adbd1df70c6400ae4e4. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/CZJ662200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7af9d485edd51dcc72b7dc69ca7623ef1025688ce7a2adbd1df70c6400ae4e4. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/CZJ662200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9232296394fc03575c648c57bdd5ec82536463c6024f26e3f57f10bb0fb657a. Chain 2 (Bitcoin): anchored in block 958861 (2026-07-20T10:02:52Z), 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/CZA232300273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd445aabc3c13e60a8c8f4a8f8711882bdec3906fc081dad31e7c014150ec7b7a. 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/CZA231900477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4366fdce5f1e422e435de25085f1a0a5f88d2e2efeccc221abdf980815b961ea. 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/CZA232000370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3ae17505d6f3f38bcc591545bc6a49d14599ced5a337b02d04881072fa4244d. 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/CZJ662010001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52079ac25db1dc3ec234d5ca1a47ce6186ae2a8c0d406c0c9317ebce09bce62e. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/CZA232301455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6991818c0978f57afdc0aa06b3c9d4c91674f36988d00b947b4111ed59d5e88. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/CZDO82300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8568e965aededc35eb27a6494733be91a5183ee9471ee4fbd9ef773a00a46ab5. 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/CZH442400120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac7f3517b722ce16e84c6f7a12c07a3a9f85c49aac0fdbc2d21e06de70876180. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/CZH442400121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4bf3a4cd856a83bb9632fbb5b17d0306b9a3ca288094435eba3db8e09632d2b. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/CZH442400122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccdca55752f53faa2d41c92512352b78aeda897069ed16e23f5b5afe14d47d29. 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/CZH442400126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb5f838729f145dfaa6cc2aa44f9722533928fd7d371d3c02bc1a668cda84aa4. 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/CZA541008515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6c4145a47ec0be95f48e63f7dc61330e7e9cddea726ab90a53fa1ac32a13fb9. 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/CZA541219705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32fb2ccdf49b92598d04f98a590973360f0a912365a8a23ee98beedcdb9a69f0. 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/CZZR42000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32fb2ccdf49b92598d04f98a590973360f0a912365a8a23ee98beedcdb9a69f0. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/CZZR42000001.