thumb|300px|The restored Stoa of Attalos in Athens, with busts of historical philosophers. A stoa (; plural, stoas,"stoa", Oxford English Dictionary, 2nd Ed., 1989 stoai, or stoae ), in ancient Greek
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 0xa09aca124e0938b0e8e614e986ed217ffc729a468d4ecff083cf4b15cb70e64c. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ff51a101-d2a7-49a3-80a6-e461dfbe1dfc.json and https://artists.proofprofile.net/proofs/artist/ff51a101-d2a7-49a3-80a6-e461dfbe1dfc.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 0xa6a6734de48cb1566bc46425f4b3c28e9c757f514141a07fb678e59b11032c2f. Chain 2 (Bitcoin): anchored in block 957699 (2026-07-12T11:51:06Z), 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/QM4TX1567763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd5f56c0f9def4fa4d0aea12fc28a87fdb9fc178ab6e4bab698093965ae8a099. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QM4TX1567765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ca80f03748ece6f596cdd3d54819b53df0de1761c1d272fad74454d1b3c26d1. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T16:17:44Z), 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/QM4TX1567767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b2b3447ba4c0249cbede095fb09392a7cf1a606de77e23d14c76dbd6495424. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QM4TX1567768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f30b95d93f0b850a7e913c60c2d52fc9ffb9e65c190e2f4054e6ddc47975852. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QM4TX1567773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e26339dfdb3fe6b5fad8d50f2ccf1d2b9e7d4d05c173c31dbda04bda8965f66. 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/QM4TX1567829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce758eeac868a1620b48d87ebd39b9ab503fb7f9d599728e967b8fd7378f540. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QM4TX1567832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05de34c5b2276dc1cad2fd8f8a53b9e986e686d12e3c77f5e8fdb5f4709ec0c9. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T09:51:56Z), 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/QM4TX1567834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc8dcd5122d77001d13d103645e3654775f46be07eb99eac2cab15c5f3a4a4b4. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/DEZ650710070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab456b7ff5af7673e533b66236d27fb57e35667f61571a4052a38a63718e6ca4. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/DEZ650710071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33063b347cd63ba23570846140b46a7959d5eec9ae4d0cc8dbf91541d5cde20c. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/DEZ650710072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65dbf2611ac0d313b1144e0243015783e0860833e39a7cf6529b33cef4bd8fe3. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:21:38Z), 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/DEZ650710080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3817e41b4830ab6c7cf7bf75c4232bb288d03093875036661975eea5f6cdaa2. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/DEZ650602954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a97796f6596cc4c605d77ace843943cf43628448489ebd89b237767cfa952ce. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T09:04:19Z), 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/DEZ650807883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fcfaded2419688c1111e9799331ac8606b096e8549bd11b794af509eb51c13e. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/DEZ650807885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8d639145bcf14ffc4a7631aef61e94152a8b7df0ce012e3876b6eda6ffe24a. 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/USA560947367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fff9d95634275c2cb2eca0120cc96c305bee6397a0ff2039e9ab4f9d88cbe98. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USA560783578.
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