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 0x4a581b1ba1f35e233d54f982216c7fef14c13cfd3c79c9e9c42f13b434620a20. Chain 2 (Bitcoin): anchored in block 953762 (2026-06-15T08:21:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b828e2e2-68c5-4009-b311-2ec86806ad58.json and https://artists.proofprofile.net/proofs/artist/b828e2e2-68c5-4009-b311-2ec86806ad58.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 0x1fa8e101d624d5ce171c836a0abcbf64191de903918bc7b4541b4c9acfdd6ef3. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-21T21:40:16Z), 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/USHM81810311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3e5e6878764137857bc7659475d263f49ffc3a21c1690a4a6a28a5c04cd5928. 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/USHM81810312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6907c86c645b1d1c01cce0a0e799a6b21eeb99c7b9205b8c2fffdcef8590c4de. 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/USHM81810314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d801907a5921a97b4eb4b238a27307b343944083d5109027c63433afe34c8d6. 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/USHM81810315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87fac16719010fe5fe270772c6a3ff4efedda30fe0946a111564e924deb8070d. 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/USHM81810318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bba51c9caa6c6983c73a28832ba2ff3385f10442b4f770d24b23985f06c9e54. 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/USHM81810319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5ff05b0aa25ff00925728fd02961428608ae2bca0a8b3c13f32598bd41bf549. 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/USHM81810320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c95f51f6f2a078f2dc21a78ec57247cbd32fc8ae888ab43a6f25f8fe4ce5a13. 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/USHM81810321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c894471d7e3d8e112a9560132034dcbba42af6168c22a0e35400570105023e2. 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/USHM81810324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5580031303b565dac32c89505735e471ff25b91a6d28d9661e79e0dc146057fd. 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/USHM81810328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1faffb2b997581bbec72d188fa0099509ac8ada0572cfd026fe2b2b977fe7701. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/USHM81810329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5031da462cd5f9b5fc7f3fbaa5679945e0f1675f9525e6282050a8afaa299959. 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/USHM81810332.
Bonus Track: Waiting (From Expanded Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45882638f9494f822010d84e1f59f891afcc78af765de983110d12c0602ac60f. 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/USHM81810334.
Bonus Track: Toothbrush (From High School Edition)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b959724d675224e1ac39589c5f7768d715d2dc5170c2464d0b2ed95ee372c1. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USHM81810335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7498d13efbe292e7a0d7744fb70f22d05a08a99ce425105df801d1755aad9731. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:20:46Z), 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/USHM81810310.
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 0x96cb582007e5355f0407a43a3606f14733bb2ba31cfcd83d46422fd9a9007e57. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USHM81810313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa96878ab3a95c8ce3f9034ec8f8c462edc5c78445a4c04415cc70145d55308c0. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USHM81810317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a1b1eb8d215dca953f6fb83e1126e0d4091a9d8ba3036ccd2e54a9dd74e8cfc. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/USHM81810322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82b9bfe00346ffa7838e506038c33d743139712a1c63195b9e7c467d81827d8a. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USHM81810323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e033a98add452279c80849da602edadbb9563b8aef074f5d4689bce0588b695. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/USHM81810325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5c7da0e1b749672b22bc8269776d5dbff7e91d15a4ed8e1fe19a00ea6cdc2c8. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/USHM81810326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb825968a10d9a4cf6182ebd8f4f5dc002cf624187d3421c801b27df1d202f1e. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/USHM81810327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65fa32bfa2c0427ba315f447a1f8832d5a49c5889ddfaaec8f760d641b2bf805. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/USHM81810330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94b484a335e7ab9374700271511d4c09a361462f43429fef5ee03ebed79549e8. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USHM81810331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4eba1b64b3633c772a774e543ba953a887078f56baf66a40e2b8588b219e77f. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/USHM81810333.