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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 0x4558248924c099b9906defa3c0fef503fbb032276f756f09e52abae09e9f1b42. Chain 2 (Bitcoin): anchored in block 953717 (2026-06-15T01:05:33Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/891fb4ad-63e3-4e20-a214-86cd4dd30d75.json and https://artists.proofprofile.net/proofs/artist/891fb4ad-63e3-4e20-a214-86cd4dd30d75.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x279739937d77cb9c7924856fea4f872f44850d17ab30e5d154d80976946c4ada. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/GBLV62314421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b23a19ebc49ad85c36eac7bb48afae57a8128cb1848fb2000416d8b5fb78fc1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBKQU2345088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1818eedf7fa8fcf8b56c3872c3270bcfdd462279475e03a9912f77223209b5f8. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLFL72300127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa8aa8f3702ade7fc1f97ecfddd63ebe658eb3c0957d122605dab9d016e70e0b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBKQU2313494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5e1873adc9e773e1b1dc37d2b24ddbb7ceb89f6d9339fc210f6a72de3bb4a7b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBLV62214255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1801f7de89989ce6dfefa5a60c91b10f22874fb2fe2367ec5d967fac949855d0. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBLV62201874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x649e4f2a91f26c8359ef9f5159be3b0cf107f6250f080d820d99fbcad51ca819. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBKQU2290543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c1f90d2caca9b8b6a92793a821d2ccdc77a47f93ea5bfdc9f7da1328b048deb. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBKQU2232165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d348a2853852e5f7a5be7b77086792406833633dfcd8c03cf357ff4dc0ff1e2. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/QZRP52179598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11281b79325c91db5cc7d784f7b6d1f8e999e41ebbcfa233a854cfd836f6396b. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/GBLV62134426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1732e44e1dd8bba365a07580ac3323183073ad06f272fafc6c754547ebbf23ca. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/NL3TA2109402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15f39fcbc0a40707e2b4a4ad566c84ac47fca27e3f83e6eee6ddcd3cb212f1d8. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NL3TA2108402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc7ab5feda0596d4ad626affc15b41eeecc3a1cbfbdfd2a7b74a43e6a73fdcaa. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/NL3TA2107302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85fa9203cf08d77d572f7e204f70f22a169236136d848ffcf33d5809ae3872a6. 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/NLT172100029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb30616a5ff88b4133a8e7050ca291ba54a197ffb1ee3ec18668ab2edde49baae. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/NL3TA2100048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2099fc42dc470eb7ce183ec7b1fdc5ed139464b65c7ba6cf5d039002914de3cd. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/NLT172000038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca748c55dd553887dc545b9da83b19823e02bcb78fe3c46d83b713245fa408a1. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/NLT172000039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe057884df170195bf90bd49342da9c0282eb0797f3019167c792074e61000f4b. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/NLG3W1900147.