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 0xb4e5be63425843a0a899c8304c531298dc1baf02fafa8285ce7764cbd88f3f5e. Chain 2 (Bitcoin): anchored in block 954010 (2026-06-16T21:41:36Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/34177a1c-1a12-4a8e-bbec-096fb25d53b6.json and https://artists.proofprofile.net/proofs/artist/34177a1c-1a12-4a8e-bbec-096fb25d53b6.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 0x0f01884c1464a8fd44c2b3c440b0e34b4404e7b5279cc12d8d56e3ce9ddb8384. 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/US83Z2311048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfae14ea1e4e9f7baf30530d1f695b2a1a2904e17fface7e1cc6bc9614b240706. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/US83Z2302935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1cea272df33c86b484cf86e37d697dbc316b5adf4c979e5b372e81ba63691ed. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZZ8B2415844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x144aa43c07daea8eab44adbf4ec6b2e9cbdddcffd6752ef773944a6308728e6a. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/DEH742434614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d01919934821d5981d38394a8055156b17f9b9c8b7217475743f5002e20a7d. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/QZWDD2360022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2ce302019dd51a0d5e3b013aa4f2537deeae1bed9a38e28fbf2d6968b65fcb4. 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/DEH742311877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x153983df36b1d0720ff6a064c233f20751345333966cccfc97c2ccca9e880ac9. 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/GBLV62203954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf4c3012213ca97264780598eaa2abe03be8987321019fbbb28e5a3e3b576118. 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/GBWUL2171848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74d45e31df82b3ce760ca2e6b2b6e3c9f119528a9807fa0e3b070c25f3132b81. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZW9L2441201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x155fb30937cc94934ff6355080b461455886a42b1a82951c03ed355b70cbeb20. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZW9L2441203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94ac5475ca769f7e639ffb7045455d4a7d5878289bec08cdeb9af3f8d63fc75c. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZW9L2441196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1be040c477088f79645669877135fac74d800adbb7ef87daae43c22f4fd1a3d. 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/QZW9L2441204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7e3a8b3aab76935989aec6af447b0cd233eae0f4cabc185392d7179ec02d7f1. 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/QZW9L2441198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbecadfe8d7d7bb8dcb48152fd00497ae24b04ef099277ecef6344613f8bfa14. 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/QZW9L2441194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cd13ab5017fb69c9c7fbd4341a990dfb551efbd463b0d8e9dcb6ca97de511ec. 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/QZW9L2441199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b9dd0374e4b43462ea486bc00de5cc49406391aed568eee5ae0d4be787cf1fd. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZW9L2441192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5962f5f3f17f9806ef57341a1fbaeef8364175a5428303f82c3fb10225e2bfd2. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/QZW9L2441191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f2f0869d4d10c600c9a6275ff3f8002b89fb12f0bd6a1c7e08a66ac6ab907f. 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/QZW9L2441209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa3e66391c02adbc5962eb5efe4ab9c9ce90f41f20a02e78f476c1e39e2f5053. 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/QZW9L2441208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad529b7ecbec628edd67b7a6f1401bfd7a06f956437cce109ef0e4cda2e9bf79. 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/GBLV62023758.