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 0xdbf09c8ecdabd1021ea680af10dc11fb76e673c3d058df8c2fba9d1a33faf7c1. 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/07dff44e-29ba-4bfa-a5bc-3b0a33aca982.json and https://artists.proofprofile.net/proofs/artist/07dff44e-29ba-4bfa-a5bc-3b0a33aca982.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 0x801db6c5b157a4712860437a5d63fd51f03f4aa5349a5858eefdcf80e1e13832. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZHN91978818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3c0e35546189b1cba2783fadea5e173e8cdfded18c15d09d81a69c28fc28590. 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/QZES92013532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fbe7e36c682c4273daab1fc28983da43219915bb6835c58b4ae770f3c59058b. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/QZFZ62196633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x775d69ec833acae4fe1fbe5eaefd07f7514103761b87264ea1e447c6bc395a2f. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZHN72117593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d918ad5d84fefc4be1060246cc4e7c72ed805ef4893c6e32df675d5289c0a60. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZNWS2135582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e2bec7d2c3d638bcaf1df48ee2af44c1027d82e06c4c3763156d535aa11620c. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZNWU2117539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0e3d82d2e1f043cc103e6ca875b50a49aa1bbdb7ebc32cec3c2dd1fb400547f. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZNWW2159658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e2bec7d2c3d638bcaf1df48ee2af44c1027d82e06c4c3763156d535aa11620c. 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/QZNWU2117539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3e54100e9a66ca4f1ea7e1fd92b0a6606ef9f9de5ad19698b56acdc71d6a45c. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZNWT2227203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6142999fb4a22bada4edf74412ecfab5665214b6dbdc91182e2c08b5acb4408c. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/QZNWY2227693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb43cf40322319445a257d19372dc6d20a44b35b93d2cf66f3242a835b065cf72. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZNWZ2260567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb9d52cd8a61dd422c58624a696f2881e59eaaa8326afe6250ee3997c7a4c0c2. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZTAZ2217326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54583a20c932892cb63811f3a43d899404f9acee9672e6fae26ed89e8980bcf1. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZDA82556647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe15e8fe8a5bb637bf996c9c63b48dbc6e491b3a17ec502817335533b83a3c0f9. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QZES72581602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce45d507531144768ed94286174d91f39e0d17c039290dfc3d2fbd2ed407338c. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/QZHN32537669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2870b279d4ad48c81018317ca0569d4ae4ab0678c581ba25a0513502e121df0. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZHN52550419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb263a8bbff65c249e4968fe4f6b09fe0940d0ff4685b0cfa80efa0ffcec0b331. 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/QZHN52550420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a139242c2a6977cc11511557b6ad0c4d77bed0caf8715dceff2a57920dda62f. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZHN82522196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eb1e9783faa4bdb5788c19d7d4091cbc3143b1a59698395ff6389dfba798bc0. 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/QZHNA2575801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda807485957ba27e03b49b6f049510b09bc2e7fb892e062a1182072c232a7d6e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZK6Q2540841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dd3f70375ca9eef87f418167bb03b1973646cb55b8671a17453dadd5a86e875. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZMER2558234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32e6cb1e7f6825c464cba41ad123152b2932c764986dff9ad3452c2d67da94b7. 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/QZNWS2545515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x902021f6aa2e9fb87bbd4dba6cfb46398878faed22b22858e83cfacc65861e0e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZNWU2569748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd71f07db0ddfa861d569b4c7ce584d6ecf2fd7093980a2ab98fea405d533b4a1. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZNWY2529254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb744a84ccab0bc23e4dc34c7d2a48a2d6c29cd584f417636af692df7ed8598f. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZPLS2517156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea54f3b3837cf052a4f08b7d76b4ebca79a509f158c217cf9146459f355dfc0b. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZZ7V2582576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x468d8b6fdd803ee6e12aab343261e184e0dfcfb9b99037980c80dc1c100e42e1. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QT3EY2586255.