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 0xd5f67dbe046c83a2b3003f21a36173a046336bfc20a3e657d6bcfed8fdd24c51. Chain 2 (Bitcoin): anchored in block 954055 (2026-06-17T05:51:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/446b950b-5a4d-4e21-8ab3-de1d8f7b27a9.json and https://artists.proofprofile.net/proofs/artist/446b950b-5a4d-4e21-8ab3-de1d8f7b27a9.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 0x3f499d73f3162516de7818086c76f56f3b55f9afc683131654f471c567731cf6. 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/DEE861600663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x047a9d011e2ed28f0799642716d736bb7cab96eda482c647af096904dc344e6e. 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/DEE861600664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bcb698aef24006b524cb75ca919e6d7004c4ac07e91daab233fca6c848802da. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/DEE861600665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79be10ac10fa7f526b34a9ab67f9f015b941a0365c918925f5c28d051b4d0b80. 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/DEE861600666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a0b367092dda3e55959e1b7e14d31e7863b5559e73864dc17e03a90ac95c75. 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/DEE861600667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1c6614c12c96cbdd75a0d4fdab04fc11e966b2b197d99deec70ec6ace0f919e. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/DEE861600668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c105451a63dbea7820cd52c5216f1d0928de45f81ff3e328290d2eab498dc19. 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/DEE861600669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d0d3c4a0f7a65dd7ab5373c508384b2da0d08c82fd839044f70fb5206fa263. 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/DEE861600670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85708d5e2d8df3579b4778cca8ee2bc0b3ac98cb28ae52203efc489e89725ca7. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/DEE861600671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c55fcc8f4c28449814add21b360ae4f3d24aaf3ca356529f45b3a4308ed2e24. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/DEE861600672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf93bc54ae4c0d6ffc5fa869985de87dc647e8f28f5263b1a1c5b78072e05d156. 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/DEE861600673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x133aee45de231e73993206c2f98413fdaff31263b5a71f99a2a45a3f2236a42b. 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/DEE861600674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d0bd724ea57587e929a362d96538e6cafff62a83ab665a9ad3d8cfe79f34f6e. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/DEE861600675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72c04e2d2d39056596e876ef55d43fcc38db69ebdffabc3c34efa979ac8eb5e5. 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/DEE861600676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabad34a7fca2d2abef51cd2fe99ee2efffc6260e4a149a0ffd5bc8250c50d6d6. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/DEE861600677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbecaa848b96c73915b40f76b1677e686914375ccc2cebf3f0fab9aa078847223. 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/DEE861600678.