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 0x8d42adf1778505fce40183f939c467b4c8ab2fb283d2b233e454806a17b98112. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2b68fc3e-9461-4865-a62e-1da839755ada.json and https://artists.proofprofile.net/proofs/artist/2b68fc3e-9461-4865-a62e-1da839755ada.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 0xcafe0a652d0f932e03d0283f5f07ff53925a4d0841201fcb65f08bfa71fdacea. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QM3DF2211400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c92c2049eb330489425b89478ea8cdef11ff7c0af466599b95e1a365a557e82. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QM3DF2211401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x099a9f80700898c5bc41841c0af1432f77244f0bf589123a93bf00ae66de3752. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/UKZGC2408860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21e8d29de5c9bc8210048a7a4a20a2a4b7813cec2b25223fec5ca4d5d50520c3. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/FR59R2434990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c0685332fab0202b41be648ac8c8630da908eca11c09fbd497595a9e42f0cef. 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/US3DF2415015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa26ac2aeda0cfebc8592771e49620adfd522e40bef54a71ea2c623d5b7e537. 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/NLSB72400038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9d58a5ee859703ab23605b3d54f2a53ccb805d155c12d5b1bd1c43bcd8bacff. 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/NLSB72300308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c033b9848d9e6b1af73b1fe431bb0e4525f5de6a17d714f6e69d762eec0f714. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/AUMEV2348644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x838637ba7ece23591d7877a26bd57f6fee814d0fc8fd83a69bf47fc17d091c03. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/FR9Z62300256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42a592f717d459a8a8c396b5759ed6e1284da49cc9d7353132f13d9f174ca558. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/USANG2274660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf26b4a4c18ef7d3864d9cd48905527f2329cf79ed5eebe4d30523db16d92330b. 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/UKZGC2408745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8e8ece1683d7ca580c5ff89a976ca8b8d8c1620e031d93a11ff532aa59f60e. 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/UKZGC2408929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6c27d4e1eee6ed2d775c7abc33de229a481d52c102a3bc21f01ddb5f13403e7. 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/UKZGC2408746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x099a9f80700898c5bc41841c0af1432f77244f0bf589123a93bf00ae66de3752. 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/UKZGC2408860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc97be45fb99df7c14216606a4fde7986e493752a5866e67d391fbd49381dfd57. 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/UKZGC2408742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc52447e6449e0c60b8ef2ac311b298159664039bf62b57b7bf9101b7c2434c4d. 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/UKZGC2408744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc63738302f2ed98cc76c502982a387d47e533d7c47f3f6a5bf89be2594a43e80. 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/UKZGC2408743.