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 0x09b024d67dca7c56a8bb286f26feba09ad01e43eb66158a9cc62f03cd956997d. 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/d9781958-7d43-4265-b0de-f475f0e00b55.json and https://artists.proofprofile.net/proofs/artist/d9781958-7d43-4265-b0de-f475f0e00b55.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 0x93461bf638e7a92e39a572d9d41ffb32b058fa141045c1cb94208d20930d48df. 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/US83Z2009384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ee00e2fc972cb74e4b1ad4de0bf4d18493e7f34129271cb12c0a73a20883df0. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/US83Z2012981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd04fad3d16198c59501f65075c7f9f830e3f02dab817aac91859162848cffa31. 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/QZNFJ2109601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04bc2ff411c0d1946d724056b3b0eaec94f3106facaea8b3170fdd1968851a05. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZNFJ2112813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b1fc49f3a89e4c1c454223dbf1bae3f55aae9960c8cf73e6d1079cb7f28e027. 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/QZNFJ2117547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78f143cadf0d7c32113cbde4d3ca78741e3f0a612a036f730179014e9c053471. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZNFJ2201155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7edfb52268b61568761a049fafea2ef2ff3ae6514d7fe175e1c4b0a5ce937858. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNFJ2300500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x818ed043e04717186d8ecc307d60ccc67c512740188567989a41c75ac5256668. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZNFJ2305759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaa8db2265c69d5897be76f2a1f15f6b6a52392ea45af9b8a172f46ce15210e9. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/QZNFJ2401475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb68cdf0257d2deb772190a6edd6e8e78e911aa02738c45d73bf55c895a439320. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZNFJ2414542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x548544f248891220a88f82ea60afcb2c4fa9aa11852fdf99fffad31f9c80b2d2. 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/QZNFJ2414888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84549d70f69796a3538c55e3df66a61339c16e291fd227f1442379e02aae15dc. 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/QZNFJ2416884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x240308536dd125fed67cf74228b405fb42a87d5bacf0bf8627cbb84e437bd73c. 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/QZ5FN2517592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9e227a502eca367666bfd62d439ce1eb90dfa6917944d9855b5909dd315faef. 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/QZ5FN2594923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50a60c745300a10e6852d81ad762d371759ed7f6851ab8aa34c8a97a433c8355. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/GBWUL2574688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd88cac00e1f667882d9a031984a31fd5c3ff3f506182180aa0a140bf68135169. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZTRX2581852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe372ba542db0b49a5f96f77ef4947849e14cc8d47642bad4e880323c5688896e. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZWV32597285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x663a9ef54d8ce1ff8378143e0956b4fa784d74358329ac20f3b659dd02d5a9ad. 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/QZZ8A2532543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd926e24c371a20911f18e555d767a0d21fc53049f205fda93683a9972198e77. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZNFJ2405510.