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 0x54b0f2f769d5af45be124c1ca6aaf5e369a3eb5b26055cc024e5c4d2e68d29a0. 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/1a1b820e-1838-491b-9d13-833354af4e38.json and https://artists.proofprofile.net/proofs/artist/1a1b820e-1838-491b-9d13-833354af4e38.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 0x180fc16732fc88cf3020176f2054df7f6d705ceb989d7b9654bb728f5a7a1020. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZHN82023088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6416e6ac18e71ee62d10d7b3861a3680f05127999c714caa6fcfd19d8e5ef0f. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZHN82023097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b3deffeaa8bea9f15ea697970da3976e282902b8f08b3171e1d2fd2c36da7ec. 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/QZ8LD1710540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e11fa2d642f69b9f2442399ee96f1171033b88ada3e36c82483b34a03ef4f21. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/USA2P2143391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f267c16e589d2004d700cf0308854bd99f5cd41bcfc0b35fb40dccf2ac96d95. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/USA2P2135778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa85cad4f9bf3ed525f4434b6ad457ebacaf8ccd9b68311b75ed9fbc21f8ce60b. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USA2P2135743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x471b2808547be669845dc21ff6d563c5190ae8dacb2dcf403ed53542ebe7f5e0. 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/QZK6J2198060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x780df5205d95739a945fbfb112ec2e3f975a4ee1b2b32b802ce8fc209e53743c. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/QZTBD2499565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cfc6839af50a603fdedfd8bb0d4841895c04bcf5575167d1452465778e161d4. 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/QZRP42472885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4901ab4a5b7b18d5e4d4042c51632918d29dc02d2a41244f56cfa79bc878a77d. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZWFS2584300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x005ed93061f355fde9a87d3c854d72c3fd043ba8ab17841f9654c9987ad04270. 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/QZ5FN2471964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeed4e0cf73a800d11d2707b5725fcb4b800008b01693e9b53783e551234f4ce. 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/QZ5FN2417504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfda2ba6b152ca1ae32cae746fd5c3599807a17129087b5d2c8e0aab795845a85. 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/QZFZ62316344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfda2ba6b152ca1ae32cae746fd5c3599807a17129087b5d2c8e0aab795845a85. 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/QZFZ62316344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7592ecb069046aa50dc97f61cad0b9e97cfb5f6e2951ee8346fa5ea7a2c33540. 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/QZWFE2388908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80674be198dbc594381a0769584a2d6f9f7781842502d2bc4ffc297f796ff790. 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/TCAET2043630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5acd28f67246fe2edd60dc696a2a7c1d9838cdd12ce359a71e2d3f7e6d6fcf7d. 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/TCAET2043654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ef5138d680506902ce1e9ccbb184cd9e1bf09380fcbc1bcd7d4b8f9731e660e. 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/TCAET2043823.