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 0xc130f07dd14dcdeaadd29034c7575cd884efeb9650785da5f1010954c2d79c54. 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/b9d85da0-6caf-459c-86ba-9761ac105858.json and https://artists.proofprofile.net/proofs/artist/b9d85da0-6caf-459c-86ba-9761ac105858.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 0x9c7317e36a82dd5e43b5c87c6710df86431ce883025b658258a2d6fb3d963f6f. 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/CZA250800014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa355516723d636eb8b580cc300003fcc215c9eb0b544ea6f7cb2d5dcb757cd7f. 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/CZA250800017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b2a41ff815c6f97f44e1d6fd7a9e211c1eec1963644970c15265c9cc0c3e307. 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/CZA250800025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18bc8e7e6e2826230782f69bab0897eca91ae962d7c4a1dd8dbfe3caadca2121. 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/CZA250800023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80e1e226a88d5d69c6c57d5884ce426531e5f66955cd03ef51e3c9606db1e039. 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/CZA250800019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cf5f73db63168b554ec003a8d015b372cbacf5abe7c82443cd585c630401e65. 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/CZA250800020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f31f2b3a1eb64c1a3ce706ed2ae3456f4a8b93b1a5d088582c6df5511e63edb. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/CZA250800018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec80cbc5b8ee44986746cdc74212a6c42a9e7dd1771687d36175f228c4d74d6c. 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/CZA250800024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0b90698c497054630f7c37036f3d19cb3fb2dca884dcc4582a30a73d80a3794. 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/CZA250800021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fbfd0b20a15213f009ffcd26ba46eac38b32ee059ef76d3664177ca37df34bd. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/CZA250800022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf6940bad67735847fe5d11d02f3b7a6b88cd1dbc56ec09e266df4aa26480f31. 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/CZA250800027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcab043b237ed696bfe76871fea55d879d1638bf3ef4d6dea156db92a1e038d2b. 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/CZA250800029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa304320859a34129edf874f669047a39599a288845b1ffc65164167f90847ece. 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/CZA250800028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55c2155b48db5f652d4bc48dfafc55d093b3f757b2cc77c55eee37f7ce4164e2. 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/CZA250800026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x326de1d22a7b20f01da3cf639239ce40069a2fe4ba3e8f5895342d5918d094cf. 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/CZA250800015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa65e73f7e1ea329f20fb7036e947a9fc1991f66a3f04e049e35f4c7ecc0e0766. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CZA250200949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb7e0fb99ced42a3e34e42541cd362c0ff9023ad178961d8dc16168a8b3f91ac. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/CZA250300096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b2a41ff815c6f97f44e1d6fd7a9e211c1eec1963644970c15265c9cc0c3e307. 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/CZA250800025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07eefb0bfb02a528ab482fb31b6abf17a77cf7f1f6a2387af84e28016e570138. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/CZA250600035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf944a795abe9ddc700239f7bc507ea02bc08de8369bfc15b8cec6b0edffe7d6b. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CZA250300084.