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 0xac7c6b6397ea12644507ff6101871ee0cf60a7fb15113360f2ff9b6b74976de1. 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/59e2dde4-28c8-4429-8418-b3084df5446b.json and https://artists.proofprofile.net/proofs/artist/59e2dde4-28c8-4429-8418-b3084df5446b.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 0x4b7acd4283cb8857324c701447676e2662f93a13bd4bb1d3ff200eee10861ec9. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZFZ32091291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x571c4ecc89343676e41c89a8b2da739778d3037c9200aaee973628efbb458559. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/SE6QE2046752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5d992fb176f7db7968fc882353104409113c9a9f53f2d363a7107f514a9af67. 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/QZDA82179152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe975e6896883a57a5b53a74018b39c9d9c5459d5bcba27e8adf4e86f12ffde. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/GBRKQ2112908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9db1c6a4f0fe5d50f611f3a44e34ff186d7b46e2e0ef36c7af6b68525d5ae239. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QM3DF2140632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa49a4474171f75e15bbdf7d8abb62a1f29d28a9c35505068b694e563a3965b. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QM3DF2173713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x660b8879593205158ac5502629a6a4ad8c517b7fe80f74beef4ff4ae36fa5123. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/QM3DF2173721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ab372ea081f0cfba821cabfbef47b92c7fddd60b309fdf83664f34d744dbb82. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QM3DF2173723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc8ee6af25e2cbf6dd7abe06e66916e84f84693cbe75aa4365b922b57202317. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/USANG2209948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x526f0797153cabb891bc9065b2a8aeb5c760ac2bde2b41d18c017caf931d6327. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/USANG2209949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6133cba8942dba765511ff65273c53deb03936657e3e878ca056dc2de5224d68. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/USANG2246155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ce9dd7de2f035e370acf0f6473ff502661ae4063e7b1f641ecdf8038b653452. 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/USANG2283417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2de6084a9c2f446eaa2f2404053f6fc4981f0ba5f6912da06491eff4653379f3. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QM3DF2219158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf816d72accdb101d01fc490165d644d9be11317b50864e648b42bc3a036a54e3. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/QM3DF2219164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe77ddd8fbfb00e7b05699807e389eaf20be7f5f6e313ac7b59c218094cdf6d77. Chain 2 (Bitcoin): anchored in block 958828 (2026-07-20T05:21:06Z), 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/QMANG2201629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3d8f7f3dea65cf8b4b38bd94bb16cf29c868b177f9da8c5b9d459c2f5a076c4. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QM3DF2410552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbd9c2238d9a5d152a0160a709a078791c3ccbfa983d88f6f9c1246a20968a72. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QM3DF2410554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25d535e0f1eb1d988685cc5690b365cc07b5b80a38407801b76e5ab23158cb36. 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/QM3DF2410556.