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 0x7ee41973ecb240703bff9f04741313397d9a22d681be3b6191df81019f197e1d. 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/f1f88ebb-d06b-4bd5-8d71-ed147146d8b9.json and https://artists.proofprofile.net/proofs/artist/f1f88ebb-d06b-4bd5-8d71-ed147146d8b9.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 0x2c5707018208e01998b688b535215549573ed653f0d6dc56f853139d9d7f7327. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/TCAIR2427744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x430197d5d1c810922fbd0e837bd74195899501fe58e0701a36786e0ef9a7e83f. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/TCAIR2427752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x656a4c413aaf145396af15265bbab75176217912c4807074f1d055d4857b3974. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/TCAIQ2427764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b3692e3639d5fd1835ceee0556660c4fdc1f07b3d97cfeda6b5220c4e11bc90. Chain 2 (Bitcoin): anchored in block 957668 (2026-07-12T06:54:37Z), 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/TCAIQ2427767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77608f9f5fdb1d653ca8b7caf26c294c73bbb3ebb7acb351e29e71d52d910258. Chain 2 (Bitcoin): anchored in block 957663 (2026-07-12T05:58:46Z), 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/TCAIQ2427787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7869c615e1b6ecb81271cd09decc7d19cc698c0db752f517b7a376b127f17587. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/TCAIQ2427789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5010d3de32cc7372f477d6e4f12ee531de9d27b6d8253c31bd5a9e16cc744e9c. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/TCAIQ2427829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa78542094e763fbb0a55996f69c540acb42ab9422054a5c4580b8971a3c58493. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/TCAIR2427834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0871b4a2ffff0dcec1ca4913771de09388cd01739d2fe6f6e5769b47c7065fd. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/TCAIR2427840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0353275e904d8dddd05689460ad3caaa164a4f3bca1bbbbccd12df9b28e57e1c. Chain 2 (Bitcoin): anchored in block 957674 (2026-07-12T07:50:41Z), 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/TCAIR2427856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe761de71b299df7105a97b3e961a0372e6aa36e16dbe4d3d328e5d2c3ac423db. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/TCAIQ2427860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe6e92b863a3a7abe2c257786a1304befba8c40dacad5ab350eadf235626202f. Chain 2 (Bitcoin): anchored in block 957676 (2026-07-12T08:20:25Z), 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/TCAIR2427864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41939bde4ccaf0c4da7c1d488e232557a8785d54e33bc449f73fddd28079daba. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/TCAIR2427870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c53d7346cc9806968af1a2c6171ef4c68cb2e0970d206c6622fae256dc74a6. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/TCAIR2427876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x171121cc8c26474f8cd1fb1a4326a3fc10dd07e27ed2606a8dd7123dffa59afc. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/TCAIR2427880.