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 0xc302dfa4e1e670f3868bcc4be7b5dde3d0038027ef06d39978484569a9f2f912. 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/8d0955b7-5335-413a-86b0-a6fe18c86fdc.json and https://artists.proofprofile.net/proofs/artist/8d0955b7-5335-413a-86b0-a6fe18c86fdc.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 0x19f2c7bac1d583c9dc80b16013d113190f16e39c078f870302f4b3fb1783953e. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZGWW2081578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4105580fdeacca2eddfb5ef7e4669f882e560919b13414c70975f998830c59d4. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/QZGWW2090826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99dea5acdf51aaa0a8fbfcc4c622c78539cec7d4a3b22956a71e9ea198fb1195. 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/QZGWX2110221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32d180b4bf45cc703ad55348a6ee49af1ec6c8e5de7bf6b14507f4cbc732dfb0. 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/QZGWX2153531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b641d7fcb7b0628e9536fe66d57b843fc89bdc98d3b1542b2fb8258e9ebf4a. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/QZGWX2231896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8fd7f4aaa38b992fd192115d9e139d572c41c796f8a69351ae956001358ec6e. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZGWX2236444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbea3a316ecc1861254654898c403a9d2e1b0d4d0f716116bf5eb474a8ec22e75. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZPJ32176059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ca309df605b1e3a7524533af044e275bc0c8e1895cdf4ed43241fb422ecd695. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T16:30:22Z), 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/QZMEQ2390438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98867e233a74ce88586fba3507670f87300b75e41ee1749e6dcdb5a04cec6e6b. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-16T02:18:31Z), 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/QZFZ72460572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b641d7fcb7b0628e9536fe66d57b843fc89bdc98d3b1542b2fb8258e9ebf4a. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/QZGWX2231896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdf4882f830c665dbbcbefba1dc0767b78da71881a42f94d88ab40f77afa33a0. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/QZPJ32328937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dbba442ea2694bfcbb408fbe26ce157128c336e18dca987611f7ff9bd9145f9. 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/QZPJ32292223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfba10fc44a76160090aa07bc8e3617bb8daf09903c48fb049ccdecab06a38c7e. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QZGWX2158902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f2c7bac1d583c9dc80b16013d113190f16e39c078f870302f4b3fb1783953e. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/QZGWW2081578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x074e5d8b030cf8f0c7dcd6c5b028824adb4ad27824bd608f3c3884df7ecd41de. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/QZGWX2102131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e754c5d9fbd11dd4a578d15bc46e3a622c0d1498773956a01fea7eb99056ff2. 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/QZTB62442235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49249af71713d98d84d551ab567850ceacf54e83a8d0e56705885717a1a881d2. 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/QZMEP2593650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x646b06f1952ed80b2cb9e70f101411079409e4b3fe434b89f9d19afea187439f. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZPJ32463382.
Heartstrings: An Instrumental Collection
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea0b96f19f0080437664b15d9059335443b207e2b24bbe6a32b9b6f1bb8c131a. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZPJ32494801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86b72c8ea48e510ea5760029fe356377d1823a9ffffafb5bc850882b53b18af2. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZZ782559526.