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 0xbca254ea2acf4d9646cdcffc3b4bb1f861efdbc44d538972dd70abafd270f590. 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/b91145a0-7bad-49b1-a483-94ebc5f13975.json and https://artists.proofprofile.net/proofs/artist/b91145a0-7bad-49b1-a483-94ebc5f13975.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 0xb86b8714b05b12f0364a1faf93edfc84588e215016c9c8ffa8b65ffa6374978b. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/QZES81836621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05b1a5ae6631968a416765064eacad66903b4843ebfb5d37a078459a4f9a4b09. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZES81836622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4296ba1522043b1d21cbcf2d8e1072efa226703046b7375bc7d0f595b650faa0. Chain 2 (Bitcoin): anchored in block 958668 (2026-07-19T05:16:11Z), 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/QZNWX2134167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc090fd92f5a342164aa2aab954992d427975af98a8276171e22d0f894388bc7a. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/QZNWX2134168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x832ba1025108f80409d3d09bb5030411f838e200ead8c13a37c9401c8a667f49. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZNWX2134169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04b5b3418666b7629f7d563a23474010c09aa7f0fb4591be712829ab029d0221. 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/QZNWX2134170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x010d6dbf9aa5eccc455c2269ae99d4f9ec75bb2f5a20d395422162bc44081603. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZNWX2134171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x630ddac9f189e64682560d7bccd8a817f5a4335a9009d9ebc3c8324d7196c51e. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZNWX2134172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb379c15e017f55a2349158c7643d63c5fd57d9a58957309426176977c12b86ce. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZNWX2134173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b7e6940f794e9bfc3fab533a11db96bc4a791cef2a382e1a93bf5bc27b51316. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZES52512101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf50b50f6161718a780d1b0d97ba31b27191744da0fc5fdada81576e0332bc1a. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/QZES52512102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06cf08bddfc367978b0af998636c67122026d1050d67f17950af9c8a6d225b70. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZES52512105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x530774d2d1011fbf9a4197d8d9b995f393e7afd6b580c96e4aeb0b8237de9a81. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZES52512106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc593af9b445a73a45c2fc8566b166fcbcfb1f6ca57f477e68ce0d74308f41341. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZES52512107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x098b0a37fe1ac65706a011a6069a7507a2f3e700fea3748cf2bf12276af5fb39. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZES52512108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x230a1a0c5c1d13c87bc884c38020f777b4a46e9923105de1c0664cb9c7691420. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/QZES52515751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1c854aa626896bd99d4670c07369624c752731d087cdf67fd5adf404fa9c309. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZES52515753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3c9e6623a9f36800ac3c8cfc1544ab584c75f8157ea8d5741717144e001d22c. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZES52515754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3994a416e2501de9072eec378493e595e737fc4e1d8d2c4811d4dd6018e53e0. 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/QZES52515755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3829321192ea558da3c468ef56be57229143521011b38ebaa6fedb1a88cdb08a. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZES52515756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf85124b0375199d8df4079f1493b0160459191a82db76318e5254d0f16c48e1b. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZES52515757.