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 0x33b2056ad7f77b676c2426c7ed5470f78c4aefd8793275ce65dc15f47cc8d460. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cb88d536-2ad5-42bf-aabb-3ba979f7362a.json and https://artists.proofprofile.net/proofs/artist/cb88d536-2ad5-42bf-aabb-3ba979f7362a.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 0x10f88ade60857d05ceab5f05a00e0f4d213a538c367eeca3210ce5dd06039c66. 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/QZNWR2300392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f009ae8a69dc39ead470b74b68b6fccff2d87efb4c4c14d093dc0bb99ea3ba2. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZNWR2300393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafb3460aeb02d39718b7b3afe05938748076fbefd11afb4ede4e7cbecdd875a3. 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/QZNWR2300397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb054b444bcd4c46d80b6707a7f7980b91985ef5cafa7c3649aded4d2efecd2b. 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/QZFZ42364774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1df5b6c6a4fdc064f0695567f7fa382e369822291b9ff87ef86d269b91e44f60. Chain 2 (Bitcoin): anchored in block 956970 (2026-07-21T23:35:11Z), 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/QZNWR2300400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0be4c4b92b7562a0a55f14a110455fd1881306c5fe164baab7894031a55cd0a9. 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/QZNWR2300401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d944a62af2a83fda1abe745d9151e32d8dd113ec528d1a21969b143e8d5d068. 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/QZNWR2300406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b2ee4dcbe493fa63e7c1b6653bffef6b2768319f417d207a0e7eede47676005. 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/QZNWR2300407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d1d29deaf6236de547e1f3a50ca9ffd82964ecfbb6d53d26d7d88c759b0f8d5. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZNWR2300390.
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 0xf4e6bcf280fe4167a217709c613196d02e3eabd40a36a1c8f47593b2e61e5f27. Chain 2 (Bitcoin): anchored in block 960231 (2026-07-30T08:33:28Z), 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/QZNWR2300391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6a01bdf3363486e118f71e0d6c2342798ff7be3dd59d5e22af638077f1ad244. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZNWR2300396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeff006a59c7e4cfe7937cf7175f54dbb0debd3c3dac87ba50dce4eaeb68bd832. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZNWR2300402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4373a95b1e119b8c7040a2a5cfab27e12f451caf37d1fcde0684d5cd4987e70c. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZNWR2300408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e30c9262070bcbfdec4ddfa0499473045164fe5038e6a713ffe997181d7bdc1. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZNWU2490350.
Symphony No. 4, Op: 1337, in G-sharp Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb73decd2398054128d725abaa76dd347c8a548e6951e1c6ff0adbd8eec0a901. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T17:35:13Z), 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/QZDA42531454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6094622c2385c9c2c7fe84e69f7106864392b831d7dc4fad1cd786c18c22adea. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZES82505441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98db3467effbee140192ca7d0d3a064eb102a9b37f187d38aeadfa807fb7cff2. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZHNB2556263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f50affdef0fca065e21179ecd0b28ab39f9e7a4105060f3baf6b7c5dcebcfa8. 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/QZWFR2537190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x887fd993ff3fbaf0b9f6530af652228e305e33ce72e324887250f802e5d40e65. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZES52445273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c8605ddde71b68d755c747f008c87a9b539ffc6b396f1c9d8be6e35e4b8d23b. 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/QZS632543325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a6ea4c2a0b75c4fac59153741831c574c7aad10fdebf4c045fac55331153fd0. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QT3EZ2488480.