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 0xe6094f62720fbed7dbf12729199ff47be2202a440ebc6dd0dd2df443f7033ffb. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8f5fb1bf-eb55-4d8b-8dd9-c2c220b87f81.json and https://artists.proofprofile.net/proofs/artist/8f5fb1bf-eb55-4d8b-8dd9-c2c220b87f81.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 0x41bfd59922d21ea42d73b1d7b07271bddbc9fcfc9424f679b84f145f5f7df598. 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/QZNMY2145729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fdb0f7a2ffdd10d51e3f86a066b80e17b593e25a634333336989ad22460ba15. 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/QZNMY2145730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x735b7a3c6fda0cee74459d96b4cf4209aed100097fbcca221290906732042970. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZNMY2145736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4221a86153fefce0b480d73f28acd3edac1bc7b1575d6f71af7ba17c9f1df350. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZNMY2112850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef8531ffca1acb8d89364cb4d2872c976d36574c461827007c209d662f53c518. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZNMY2112852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f9bf01914943c321f4e223cff92acee1fc591687b6e438cf2921d991c1945a0. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZNMY2112853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c7f2de41f0197bd26cb0ea7b8ca5a48a0a5831f2fd7f45aab5232b2a496be83. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZNMY2112859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x391c2460cf63563adc7ce03b883ce3663aeec14290c468f9678259967207d990. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZNMY2112862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dabce88708b16d15703a0dc2f33d9553c4c32a0f2759dc6878f1a3515c4bd79. 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/TCAHF2382508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95420dbfc212f3b63b5a737ec88347e314fa0a3e8652182abc219ba4e7be6911. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/TCAHF2382517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66918fb95616dc81d65094d3026575765f85b0d74f64b5421326330427d4e66b. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCAHF2382518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd965b5a1e254d4895026553ae7231af7e972877db398ccf67f18482c79fbbab4. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/TCAHF2382521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x734e24d7886ebe12098d54627d5fb5741aca13d229a4941061be4672f2cb740f. 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/TCAHF2382525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b6da6b8dea95897c66e5b78cdddfbfa9b91b6c9b6ae0c2da2eef4c4b2bde39a. 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/TCAHF2382528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe006d02deaff15a1a373401138c009e8d791e55ad5796e1793b8068dd3d74782. 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/TCAHF2382531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x885b42c5fff9a6ec304b66f479c2715234b7a7a039bcba41fc3df0126acf9726. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/TCAHF2382535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dba9db5c5096c013386c29d5be8b5880646b37430a12f7c3c04ff3c1b36778a. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/TCAHF2382538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9cbba1f839eb8c059aa4bffe3283950e1fb446b94e9060009ebb05b6cbbe45f. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/TCAHF2382545.