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 0xc889947df7e75cadf0f0cf66046095f00c715a4fcd8c6a880c29ef2e2f03582a. 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/5e9b4499-33cd-4e8a-9450-0b409835438d.json and https://artists.proofprofile.net/proofs/artist/5e9b4499-33cd-4e8a-9450-0b409835438d.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 0x47b6d4e59531d3019cbbd286831dda8ef3eef07f46b440840c2e861a08edc30f. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZJRC1902915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98e2d680b27cd174f8e4219903b41fa88651e68af5cec84d7fa70bbe49926718. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/SE6TI2009235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35108209fed8aee7359a3389c8fe6cdaa5bcb03e311a0bee391110a39ec55924. 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/QZS642206597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba2c4e37c50c8a8b9b825ce9087388e696a6f8e698a91f40ca0713a5ae1bbdef. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZMHL2224907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcaab0a6b3b3c31e37776118081b292a4aa827a98da443c6f845eeaf0500719d. 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/QZMHK2205959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x410e4f82cbab97a2d2aec5d0475dff24719245bc47d2a561301900d32d2eed57. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZS632240691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e54e8df55c0372ac5a96de78d377f60af66c7fbc5ea946b0a771d8fcda9e686. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZS672242069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a6d63463419441a9ac92cea2dc9bb9a254c94eac7986198c53b021b1fd9b3c0. 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/QZS672277318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7ef1f90baed4936f4e9bc98ef47f2f717dc8abfccd74f89f081adc6dce1422b. 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/QM42K2431020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46ce5314bfc986637ab3f652f7318f34001fd0e74a72561d2c426c166d242657. 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/GBMA22355243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3153716350981ba24cbe18e579832858c1172f25ebb66c742e7fabfd55943a8f. 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/QZS642155770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6cd0caee1605948623c23d47b48cc797717886b4061cdd4e574cec64c0dca1d. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZS652105968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7dce4d35682b4567a248dfd12548f1598833ec05347c22ca396c44310055a9a. 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/QZS652127427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf991637cb3e35518e3de67cfd54bd05b25b2f686b716a8682cb6b04e70ee909f. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZS642120999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x074c9ce750f10fb324c3066ad1b1d4dc5aa81382e1a05cd98d787acf1b9353a5. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/TCAEH1997701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7fce80c992c89528639cd8d08139da7de3035115442ad2c54a4a0e8e53120a2. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZS672448478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b1586fd447e567fe758e68eed2806f785538caaf1dcdec7d8e9f4bc505460b0. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZMHM2499081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77cd001a16eb9136817fc5bff11b5d8bcf57d1e12dca45c9a33ae245d291ddf2. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/GX3Q92560459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1472aff084620bc82c507a545ba5f82734897d50bd84d218bae1b5e0bb421521. 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/QZFZ62436156.