thumb|Statue of the angel of the Annunciation, , Metropolitan Museum of Art thumb|right|Schutzengel ("Guardian angel") by Bernhard Plockhorst depicts a guardian angel watching over two children. thumb
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 0x83616f75a83a11c4607eea3857e01db979ba22d4cc233e8fd09103397f5d79f1. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d731de80-cbb6-4d4f-9bd2-53879dd7a228.json and https://artists.proofprofile.net/proofs/artist/d731de80-cbb6-4d4f-9bd2-53879dd7a228.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 0x81e636c7d3c023244cf4299c0c13c1a539742af1d94fd814e94e2e50aaec49d3. 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/ATR981119920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2df3bd48d44348b8677a2d5e7e1fffb136088ad151a9d32edf43a6b561d384da. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/ATR981119921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10a0550dc1df0f873b32c15ea66efb6208376b662f7a84ac37e1ef60f5cf7120. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/ATR981119922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c99a126bc81d5ce507a777cfa56304111ed198f6d8b4a1d1d27459965751a5. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/ATR981119924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85b24b45f495e518196b16998548083067e0c255d8c7004c02c8da0577d6a373. 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/ATR981119925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62cb89744e94ee4a852baabd17a3870cf9d2ed8f1a11b24e62c208d2a588b099. 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/ATR981119926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x795e0f7289df6c18aa388a93ac21b9d9a1d8d49e2966b6f4d1b8b72cb8eddabd. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/ATR981119927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4085ba2c6ae06b60062fb85e0ff631cb23cc0ae61901c49f31747fb9922a3245. 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/ATR981119929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x639eab96dc77890ff2fecf7abfa651c8a093f4acfdf2a9df7c7ffd73cba47ecf. 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/ATR981119930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe47ced967a1b48cf4a02abb7cc4f9b5b9cb8bb5113137c5800c1edbd37867a1. 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/ATR981119931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fa2a5700ab9009aa2db931c9eca0e0c58097b04191c57d0358d6108768c9ebf. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/ATR981119932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72431737d36c50c9d5a3c9a46203646b97c49f77c9387b08a0ac2f23c1089a73. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/ATR981119935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a631c04f3aaa2954c240e2e609f2d580ce49d72503855ddd8169179bc58117a. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/ATR981119936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa073b39bbb29edca7ad8d8d8073eb0b786c6ebac35d05bd79bd90b717413bfce. 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/ATR981119937.