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 0xdee2be60cfe153fd91d622e47c651762e938b8adb1df381dd803b6ab065a4bcc. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/56e058ba-3103-4b9a-b84a-82ef34d4233d.json and https://artists.proofprofile.net/proofs/artist/56e058ba-3103-4b9a-b84a-82ef34d4233d.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 0xbdb6552aff96c9f09373cb46f5c89078dc1ffd8aba5bc1dd07d77ec9d129f5a2. 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/RSA131374607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79c2cc5e35717e317c9fdad2b575a6490c4c944b4ace2d6800e3a25cc7796c7a. 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/RSA131374608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc9e66fbd3c7e771be54aea42f6c0d80215b4292859c628d48ec08a13a647a3d. 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/RSA222300318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21b88693b378e85b719aee8bee26ade89c78a247186a4ea67aeebf850ae0c179. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/RSA222300319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x343f41b1e80995da3c22184d94dc5c83d9be51cc7673aef3b2f035ed2bc6a5f1. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/RSA222300322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf43b057966ef5842a1497d670f98f2cd2bc663724352e4494db503da3a25ac28. 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/RSA222300323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cfcd67815ddfd1a7761ea4b69f8dfeaea20f57675bc86a0671fe62460914763. Chain 2 (Bitcoin): anchored in block 957608 (2026-07-11T21:00:50Z), 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/RSA222301108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadfd52db74c35cf3b7a26d70726e2b3618c061a20b0112d246f2c54be0e7d474. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/NLE721066033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8830e94c996102eae3a10627576c8f43e2ea1d8acd73e1e668852b4d6ba30d88. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/NLE721066035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9bd487be6912282dc2a43d95cf50c188bfb1330d8f20bb93bbcb70eb07dd7f5. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T16:01:02Z), 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/RSA181339352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x094aac596755ef11ebe9b1d9c848355707e08f8dd48cfd6582d3c83e40f1a5b0. 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/RSA181339353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaab40bc54e98536f3e4dc067551fb9c044b1ee6e1e1b0a1b4b9d9b1f4503c42e. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-20T00:02:25Z), 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/RSA181339357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf79ceb4bb29cfe1012539aaca4d1a701f85b46575996a6a4e5cfb84547bf7f6e. 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/RSA181339358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c8c06090ce4a1c1f1be10647d50a65a881ebea39df44118642d546b3ce347e0. 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/NLG661500387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7390d5113543dcd18bdc1e1d004efe35ff11e1ff8976b3a9d8e1060cd345937. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/NLG661700427.
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
Festival Zabavne Glazbe - Zagreb Fest '88
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbffbc475d866598fcf57ded0175e4dc261bc4e59ea2283cde985b54190099a90. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/HRA048879643.