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 0x21cb2bba581148452d371a2b1e1bc09b52356b41b6c882da421d8357d77379eb. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f413e1e3-60a6-4565-add0-96d71742ca04.json and https://artists.proofprofile.net/proofs/artist/f413e1e3-60a6-4565-add0-96d71742ca04.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 0x61fa03272c5a95c91bd4105822ddd84cfa55cdde130a20dc478ad2b53232f62e. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/CAZ700901205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f3702faaba320fd11eed65644a8bdae7b5fbe713ccaecd4830215e28a03cb0c. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/CAZ700901208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85d18ca3332415944bb97671611e33306c9e95878e3778bc4cfe0fd08bdefce5. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CAZ700901210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8732dc51940557cd09b7ebe93a4dad28339f1d9808604903e06fd0e0dd95a72a. Chain 2 (Bitcoin): anchored in block 957620 (2026-07-11T22:32:56Z), 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/CAZ700901211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca1ea59ea3d488d6fb344c0ae56c57b96702512a832a265aef707104d1906f32. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/CAZ700901217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04e375906e7781b9ecd5d3ea8516650020b7d9ee977100ac63da66ad5ba12ce. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CAZ700901218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x601502d461b57f9b21db48976e09900b6107a794bcbeb5bd4d1425764c05268b. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/CAZ700901225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28495fac4f56f51030ca3415354be7e85c96cc0f2df1d94ce8b46386ce1c8795. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/CAZ700901228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0539f79ce5c72bd71326f4c8835bec65131bbccbce76efdec18ebcdfbfc4f49f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CAZ700901229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5476f12c2c0b2e28ca2543e379277945235226adb46ab43e424e429f9c10c34f. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/CAZ700901231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3149f638e000fc7d5486380f5eadae0ed30fb6ce4e53061e5426ede488c88bfb. 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/CAZ700901240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff9c35560e75e1e021651fcec386fefb431fa3642a7ced120cb9c2ca3e46d3e3. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/CAK922102254.
Hommage à Hank Williams Volume 2 (Remasterisé)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb16c01e6576ade95ce2621ea5a035a44a283b2413a2f1f410aab18df3929b3cb. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/CAK922102424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x337369975fbf7f00eb3c1c75713c58ffe76e3bc381136b0dc479e02c7c0052b9. 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/CAK922102427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00b2e8ce126eecd02fff5363eefe926e88a46043d537f7f4f65f13c4cbdaa5e0. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/CAK922102432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66cabc9c8bf6a6e857870d2da0bc6c219b59eae551550b0ac6f897201db7eba9. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/CAK922102730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x132e6e5bff5191578ca497241af2cd8971651af397e4e6697510f9ab498e3bca. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/CAK922102744.