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 0x2ca727793e4c2f546b2ba135f3d8949dd23004432002ff6d5592e327a907a948. 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/4b0f28db-6613-4a75-b485-5de2dc721aea.json and https://artists.proofprofile.net/proofs/artist/4b0f28db-6613-4a75-b485-5de2dc721aea.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Take 4 - Echo - Hideyuki Hashimoto Rework
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 0x4497c38a05d07e6591e54f60bdb9db015164b0201fc43ad82fe203e7e7e0f2f4. 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/DEEK22200005.
Melancholia - Dominique Charpentier Rework
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xede0d69bdd6dd6332c2e64f3b56fb882d77b77f1c9aacc27fd1a95537591edd2. 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/DEEK22200006.
Life Goes On - Hideyuki Hashimoto Rework
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x918ed6d97be1ac55d33c7ba2988f75b886e8bfcbc2bd6d1039398f5c65990d15. 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/DEEK22200016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7fca6962590f45a992c9794744555178296c32778ad31a3fd786dfe811fc3fa. 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/DEEK22200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60d54627919508de29b33c2b7bde8b34ab9b1fb734379b09998dde2a71a49a7b. 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/DEEK22200008.
Take 9 - Planes (Barry Hudson-Taylor Rework)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdee6500fe8b22231d78edc179d4d87f38026c6bb5f2f7ad9ed2ceb4e0cd96c2. 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/QM6MZ2178928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ed4e3301f24240e6e54edf22e6828633d6b7e161c420c23ca9f3b5f7bc29ce9. 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/TCAIK2460054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1c4f9d34506a5d3905c9d0fe4ef6f2bf165ec146d4699f26f0961de1edf6b64. 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/FRIDO2313157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe102a1f6b99e1bebb4adf405f7a88c3951e30a0b455c43746756090a8b95ffd1. 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/FRIDO2313158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48121689c997a7acbd8c0f61e75e653b1dfca08bf44975917964ec5277790e95. 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/FRIDO2312764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x600d97af7cc3e7b3e1c5cc3fef836fb2b71e27109fd2ea54a3d32ad7bab0bca4. 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/QZ5FN2329632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c7da76d57e86fe36886ed92c87109f2719020f75ecebceaa53a6988c6324492. 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/QZTRX2200304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b00a901323ee72d051e765d38627b001571139a3e8a858809b749835ecc2a58. 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/NL4WT2200125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37602b0e6db0836377bcef035f927ff5868c2875f489eaf543d8ec819f5327dd. 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/NL4WT2000152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x263c9acf0ba0fc2435d9af04d9d96651916d30ddbb319e875ad41864537177bb. 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/QZDA62194939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f0e4f3c739a4574730eaa45fe53b542b21cbfe948c6bc2b529e875f324c09fb. 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/QZMEP2089102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13be2924772ad89042ca48b5002b8c0cdbe2344ad16affb8c6fe443bf85eda82. 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/TCAIQ2481354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x469aa282569a7bd3f9ecdd0b5bf23712dc8beb0b423eba8f5d06b264d7cffd0a. 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/TCAIR2481451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f91d9381c3e643cd22e09997177ae07e57dd1d66272ad866fd90fbc101a1f15. 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/TCAIK2430219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10c310523193de710fbe79c8412959f4068e7a491aa8feb920b94684d1b3940e. 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/NL4WT2000157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f91d9381c3e643cd22e09997177ae07e57dd1d66272ad866fd90fbc101a1f15. 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/TCAIK2430219.