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 0x91ce0c113b6514f19f998b46ccf3cfb38b40d6addad70243985d5b2618779041. 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/8a6d4531-a33d-4120-a31d-ef50b243b641.json and https://artists.proofprofile.net/proofs/artist/8a6d4531-a33d-4120-a31d-ef50b243b641.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 0x9dbfc3225c4b7817c58426e6fec60363ce3629966f0e403bbe499a5e76ec899d. 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/BCQAL2300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcea4630dca14cd92313ea8416dd5714a2e4a889f9e2c344e308c1fca9b2e769f. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BKNDN2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a5bcf2acf2e853d2c7e4f82d42b9f3f098335a5961dd85887a9d0b30a8c76d6. 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/BKNDN2300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00d79642305cc4e982519fbb69e584a2285f62e8ffc1f29c6d0376061baa1873. 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/BKNDN2300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29f9265c49b6d51b245d6fd81982a41d05d09c8a17ed1c93d0e8e5903fc4e1b. 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/BKNDN2300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x465f2c5b550b1a971daea5b5858ac81235e67ee12851fd32f1b36bcb5be206a8. 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/BKNDN2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf6b38214e1fe3160e033ac45f222e217d040d1afd311564c4df06cf312cc0d1. 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/BKNDN2300017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58c12fb5df6a63a824841e2495476c757b8e55bce13ff12087bc8b9bceaefc00. 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/BKNDN2300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x916e570f1627675d3e61f55914d748d5e3be836e39dc9f77969826b73ea4d180. 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/BKNDN2300016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc311e0ac797ddb31bb81ea5b6ed0ce648456c7c32f0cfa5f979936102c882164. 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/BKNDN2400036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x258c8654bed9e5c66a44d13c5f10ea654799f4c9c263193c0d69dad7f52945c0. 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/BKNDN2400033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9272c01d8ad0105ee28b1553df45b305a81d2dfcad7c4f7ced1160017e1368c. 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/BX6Y62400018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe6aba9d931752cc4c5fd70be42a3fe999e99cd4386603e3634b6aa1a17af14. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/BCA2A2300182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27733fafcc1c2d0d556f33af1537b65d40738e3b531065c0d5616dcc03508f11. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BRRGE2301008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x972cec3bc0816887eadbea431f117404ef16e9467922645894f321a75efc1383. 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/BKGBP2300018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa525ea79c3173b62e972774c3f633c86a95ea63f56d256780737b644b7e9d130. 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/BKNDN2300050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c1350763e5c9cbd9ea14aac2e2872f79070b8bdb987900660d7a3257f0466c. 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/BKGG12300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a5bcf2acf2e853d2c7e4f82d42b9f3f098335a5961dd85887a9d0b30a8c76d6. 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/BKNDN2300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x465f2c5b550b1a971daea5b5858ac81235e67ee12851fd32f1b36bcb5be206a8. 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/BKNDN2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x499638860393889aa48b0ac63a94fa8a6b6040684528e7eceacf3ec6e6305eb7. 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/BRRGE2401132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c4a9e27294bdac227d6a660c97ea4a31331fe51a5a0d7e06b9809f6608a5d95. 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/BX6Y62400088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27733fafcc1c2d0d556f33af1537b65d40738e3b531065c0d5616dcc03508f11. 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/BRRGE2301008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65071cb5f76a3d476e18c878092f3182e14b1dae5ff612e43ba5053647be4a3d. 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/BR5TG2500013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4fb1b85df991c562b3fbab928e220cae306cde101ba3d2861c12019e406125a. 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/BKNDN2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7dbbe519776fc4cc88f2ab7582b51f9efd060ff05db626a25b6d7df1b7a7d08. 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/BC6M22407859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dbfc3225c4b7817c58426e6fec60363ce3629966f0e403bbe499a5e76ec899d. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/BCQAL2300015.