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 0x163f0b4f55571bd8aca8538fad0ae4d25772bb37cb48313ed1fb6bbd59dba8ed. 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/235c8815-286a-46e5-a2b7-3c8d32d6a2b9.json and https://artists.proofprofile.net/proofs/artist/235c8815-286a-46e5-a2b7-3c8d32d6a2b9.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 0x94bea86abbc68ed8ced0df09569e691930dbffc47acb2be1e65cd640a657e688. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZNMX2400387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b918f842eef33838a4ce8471e481d268dbe9beb51d1938d277a7f5db2da4d5. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZLL92543264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f6345f47ed69f211abe4e6af8bbad1e6aa892432ea13cc381be71b0ea1fe47a. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/USSM12500837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b12383a83ecee8a485beaf6f2b8e4b28a5e0f07163f38c0f0a50955705d5154. 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/USSM12500978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4bfa174361e0f3d17e8446df35a4e730b741fc0c40bcd17a165537f2b10e827. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/USSM12500995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe69eb140a4f9a3971a6fb5a14aa34744f9ba7d786158ee1a8a6d160978b684d3. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/USSM12500996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe658b635ecb709b422c368516a6ebc23b8688e6558fbca8cc641322b241c87d2. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USSM12500999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f23dd20b68474e90ab3b74f446cad69b775437a07f47866e4a57552b3138fa7. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USSM12500997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac8534642016ee1ccfcadd9b120842924ab06654cf6b04b6452c69bebaeaf932. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USSM12501001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3394e8d6893ee8f45413c015afadfd4dbc692708fb75b28ff5c11084b811aacb. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/USSM12501365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8676d7aac03d78dada6dd2cbc4d45b227169c004f1d7d530a8e52b4fdd38a268. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/USSM12409006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a483446162696bd5821e791cfed5d544981d6a6cae32086a0b9c5ddfcff5e2. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZNWX2521464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e170b843bfdaf58140c86d3e561ceafddfbfb19542df451664fa982d3ff1719. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZNMT2527259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9c9bcc1cba097f78d748a101d06cdebb952584d071a3b5416d7333cc9a8a34c. 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/QZWFM2410284.