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 0xac6663624a9d3602b9f69dd41c372b5c76e45df4a524a288ab339e65d71006d8. 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/a77bbce7-968f-4097-9c6e-c452534c74df.json and https://artists.proofprofile.net/proofs/artist/a77bbce7-968f-4097-9c6e-c452534c74df.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 0x706f71e822dd50346da9545d82010523cfec7afbe91c0d90858ba79e14661307. 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/NLFL72300405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29e45b6f85658b50d26aba7e72d6c1b020a4ac7f1098536d83f5071be10941cf. 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/NLFL72400531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x038b7972fd9b062b29a163c66c8f9b7e53aa9589f2a4b20a5d3624b5e52009bf. 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/NLFL72400517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4105389e95b1139e235d3da697dffd83adc20606b33a24892d4cf2352d47601. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLFL72400411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe30a1930f9f22a4d8d4d442a6b584d9291f3e4667e702632970c884764636822. 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/NLFL72400183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cbfd859b24908441e02d0ec2c8d9c122a736d10c1a61fa214c98e9e0121a648. 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/NLFL72300837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x496a86d4bdbab70e43bdd197f9416e9abf87d4cf2bb31226842004ab4487a4a7. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLFL72300794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb802f4c5e861ad3aba00e5602bf9cfeb86f0caa5fb67b806b09a7ccc60d304db. 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/NLFL72300559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40e72aa61a24dd888ce383d3c8bdca78365c9efff5fe123aabb6fce87230316a. 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/NLFL72300561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x992bc87b14b034c803d7ad7e14ef9dd14e3d2a903adfebe0a008742655375dae. 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/NLFL72300327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39ba626376088f8e076d089c78a53fdd704e90e0cdcfbbeb12898cf12e3a26e. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLFL72300065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a1247bd7a134af1380fc4dfadae34ec47481a00280896b826cfc3074cd9e850. 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/NLFL72200397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3bfb9378d488665df160ef122be7b89a44985f66105248407411e7b444fffb5. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLFL72200389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x804533c75d3a526cc2b1983bce714a9024530e4d1a08871ef565deb26773e81e. 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/NLFL72200295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x769221a3f213ab13bf3616b6fb45653d66a3085d15aad0bacb17761d3a32c77c. 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/NLFL72200297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e95ddbb974eddde5c311a7e2b9f9ce6cddf1b71fdb220ff7b846f09e96fd4f1. 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/NLFL72200293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b25db87d5118a389bab0bc728ed6ff6ddabe6b83a182943edea0229bb4905a9. 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/NLFL72100637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a25b69fbc91a005cc4d8858e27ca1d2507d127adef9bf0650a0d08be2fadc1b. 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/NLS161802340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92427995289e09939258eb482c46f6962bf7dd25a22429942c9fa1b91cff4f45. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLS161802344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2694b7fddab77bb3d12206a72d997996892626e71cf4924f391848b4a47b711a. 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/NLS161802499.