thumb|The Royal Palace of Madrid is the official residence of the Spanish royal family. It is the largest royal palace in Europe, as well as one of the largest in the world. alt=|thumb|The Winter Pala
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaddb43c28b9d5e297170ddbe75ec68759e3862e56a288fed4b8994ebbb70d0d3. 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/1b80f833-eadb-4d5f-9093-3adb95ff2121.json and https://artists.proofprofile.net/proofs/artist/1b80f833-eadb-4d5f-9093-3adb95ff2121.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x124ffdfa387605007b6b2aa5946e4da35578dedc966728858447cc86446c733c. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T19:14:10Z), 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/ITG271600319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda48dd61550823c50a8013210106590c5ca71c28b77c7e712ff296e013f65734. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/ITG272000997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a629226cd390f8f297e88247772ecf985d21236974c41f44043208e4ae6ca35. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/ITG272000999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e440daec976abe4d9be81ffecfbfdb63e6f029ea30f2a259f78ee011378801c. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/ITG272001000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x309179dd5dbaba2c14dbc0e7c265ad0f94f0a206636f66e8288f4109d8187b13. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/ITG272200631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f7139097219c2bb9cf89d1894e7a7e3b33a6a60af2d40321ce9067bd8e4d232. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/ITG272200632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x405c1623f133d66bf4529a2f791c0e646cf4d73d1f56eb0453e48e5f7024d4c8. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T05:02:03Z), 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/ITG272200644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf38fd7ebc81abb5800a79fbe1dd9853b1c75f50d578780361033446d530d1bb0. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/ITG272400321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a121a92004b9cc4b76b4fc29572503ac0007f8ac9d1a469c8f46a0ae382c35. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:11:14Z), 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/ITG272400323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbf11933df6392726dd82f2f6e940e7a13c544cba461f9b16adc2072eacd6b44. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/ITG272400324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8630d138586a7f8b8d7743e03f398c34659891f8de080d33ac1b2312f9385379. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/ITG272400326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9c5767471997e83e72f77d9a6100e1efd11110238aaa1047ae02ae13a34a52e. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/ITG272400327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x581f487a5603a78fb406c517350304eee059c1be6e0b2a927ef62fcf914e87f1. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/ITG272400328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15d5263067d32885d4403484e96fbcf364b1c7639482f0ee222a58ec187696b5. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/ITG272400329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5989f299c6918b47cf5fe2353f7fe902bced81db477cd908ee8db8c50e7bf6fe. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/ITG272400330.