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 0x8a0a1e9c358f3953623f48ac9ecded21561b0699665c9ead07936131ca554a50. 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/ec0132c0-f361-430b-bbd7-893442cfd774.json and https://artists.proofprofile.net/proofs/artist/ec0132c0-f361-430b-bbd7-893442cfd774.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 0x3e9f9b5c229c4706750fdc75fd4fc5d4778da435ceb2eea1410409e30ad29f17. 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/TCAFO2158882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f2e6c051748e39699da73849eae18c8d904c5b002a050c97dbd84f6931c78b1. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/GBLFP2314396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c2f5fcbb341aafad49e3a85d169ecdf89e806c27f8486e8b19c9d751d5bdf3f. 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/GBLFP2316734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa25617be3ce8dc65438c51c84ef6060a4d7137cf37d1635a788ed78390697b89. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/UKXN22399852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c741c87ffaa7c4f987f84cfb35f9d634141046e15ff37b992c17065d1e5b85b. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/GBMA22339305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ad168942a4a3e65c0414cddcbce9278d02e2c8d35c580ee46fddaa693554304. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/CA5KR2438080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5dcb1d51013252cc1c36c7ae177940f839abf1873bb5e8f4ffea2f2162a34f6. 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/CA5KR2449655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc3196eab578b72d16216d57e5bda9be8bc531f0a46e15bc033d9ce479b15ef. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/CA5KR2481493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ea758dfa8cc3192a9b3bf4b08dc3993b1dfc29cdba45970af926e67059fde14. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/CA5KR2481494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d3cedd5bb14a78730a4e373a391ea6758cd2bb1a19bd9924087fda4782af546. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/CA5KR2433046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x310d5691ee51a9178315a000c7d0884ef1980ffea9d84dcf0202f2f81ebb4cd8. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/CAQOI2414744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eb7d3f53322be8a0f82b2880c9201fe621c4fc29feea8d10f05510584c78ed8. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/GXF9Q2411289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485ecb834a2dcba9412724b70abd9f0ebf4feccb22f62b025879f00bfe9a26ff. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GXF9Q2550129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd563e5d3a2990e47d7cfcd655445ef384797194daefe4c20a1c72dc99930e5b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GXF9Q2558047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f304e69869f0942ca78cabc8db107436668fda694730fb6e33a680e55e2776f. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/GXF9Q2590430.