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 0x1f4a758a56f023c22d0aac5ff3ed8886290c9cb017e2ab3b3f3122e2acc2fca2. 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/dbd955a4-d5a5-41d5-b13e-fdd7bce83fbe.json and https://artists.proofprofile.net/proofs/artist/dbd955a4-d5a5-41d5-b13e-fdd7bce83fbe.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 0xadd409bcb07fcd20a01509ae2715f055fe7efdba419a4f058478f6c127dce38c. 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/TCADF1799513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee61026d9dcc8b3d439032b7fe51591188b751df30da2ec4e103d9ae24dd9c2d. 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/TCADK1760875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c27b6ea83ebda88d4f884bc97d36d27d7268e9bb51d20379b2ed5f31c257a83. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QMKSC1901003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf88252c3ad8f28e75a7f7b68e84819a9d5a59d7885c1101e603c64b98fd4931b. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QMKSC1901152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1455d9fa7565de9b9cada5a7045aaa4430b15b1c0f063e1b91b56d6d828857e1. 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/QMKSC1901337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbb689b6ce5be298b917b837f93423e883eccb4d1f849efed3b75163d320f058. Chain 2 (Bitcoin): anchored in block 958731 (2026-07-19T12:35:36Z), 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/QMKSC1901455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd481750df1fb25f6e614f458d2a9a08852dd7e8bd3de66776cc8efa61bbc8b57. 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/QZ8LD1966768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8d5a43858a6abf2e5458cc80bef1e0b97301ac5e741eb92b398e9764a216d7f. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QMKSC1901485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dfedc86ee5b96b933e96abb5bb05bdcb15d566e1c8958e6f03759661b0927aa. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QMKSC2101646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31e24e91add55d663d7fbefd1b93798efacc1c89d23fc2317cf470849a4f1e62. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QMKSC2101656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1200f1dfe33e0a336e587c79bf185cfac4ff2b59155894a545a15dd1dc5987b. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QMKSC2101663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfb12dbe582cd14155da6234bc1cf7e1c01c9a7ce917a4171e65472dbe8f8395. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QMKSC2101666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31e24e91add55d663d7fbefd1b93798efacc1c89d23fc2317cf470849a4f1e62. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QMKSC2101656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b3f82118cef6eb2939b2f07f1d3505bf9d84846436bfa38784c79d6debec0df. Chain 2 (Bitcoin): anchored in block 958378 (2026-07-17T06:45:39Z), 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/QZN882238879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87c4ebd8f0d805972df50969c84f1e958b7fc22c00d0cde0cfaa33ac857324bd. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZN882258034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1c4efd76241b9888ac532863107d4002db73625afd8aa3497e89af8828ff4ac. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZN882270657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f11643698a4c62f18f25f83ac03ed7790852df17a20fe57e7f1959fe9e464b9. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZWDW2218559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45fdd12e35d66956e853cd3e930d9800a5bd4051bcdadb6c45dd30f6c99722f4. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZN882357598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1dff05c4f5cb7ea7a8aeef75fd0dd0b9e50e9eb54d8a0d8a4d7076d3532dcf9. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZWDW2358277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01d2c723d4cf18967354e43835dbd6b403429e05916a345b085d7d5d278d85ea. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/QZYFZ2369472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32d7b1ead5df2f595671137f26e1752605672de8e275c539e923567fb15b1e9e. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QM6N22442559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x338a9f39f4f36778c21d223ef2f278c8e61e6eced632e5bb05f366c0321664f9. 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/QZHN62238258.