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 0x57c68c0934b5cc66ca434ad9b698c3200dd2b8d078be0e3fca26aa6c326326fb. 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/16f3a7ed-5267-485e-b2a8-1dcb778b7582.json and https://artists.proofprofile.net/proofs/artist/16f3a7ed-5267-485e-b2a8-1dcb778b7582.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 0xa61d44dfb4318b20dcba107567707916a45c5da39b17403006d2d83fdf5150cc. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NZKT00600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1f67b2e71a7859ae260f1f81cf6b889136fd7971c647fec5d8f92aef053daeb. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/NZKT00600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd96b5c55a0114c2b219ab946c9302c0b1d9b637d3d9f122434b3d4949f0c94ab. 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/NZKT00600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x084cc3c0c90c170c739427d4089d8a9269389b9b489ef32b4b6a7f5e3e81dc98. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NZKT00600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c10ed7d676b47b4291bacd4b0563b639add80a0de50915a496c2206511f36ce. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/NZKT00600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39cfdb85e80201a28e675d6f404a7b90395397461455887169ec4da9919d4e6f. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/NZKT00600008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72ed5fc920dc7b6b32fd147f9921172d688b4a59398fa11cee44c53a0aa9fb08. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/NZKT00600010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe7969c88233e63e4f75ca8bb1fdfacafd5e3db5faef82c41e857d456e2e4a45. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/NZKT00600011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74af37aa9d8727ce62725314b8373cde50ee316333c84f6237788c48cab6a809. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/NZKT00600012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x151e7654060d7c41d67b8d8c76df23a4aa7d53be55594081805def05843393e6. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NZKT00600013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35dc92e5bf120df9930a4aae77aed886fe625a833722f27f76e3c6704ad45698. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NZKT00600014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc46a5e2e7a2eb6ef9dc4af45ee56e7847946a63d47cd089c578a2812c94d1496. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NZKT00600015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b2d800f7e778d0c1f254cee925c43aac362f272f275a8c343806d0bc00f6a4f. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/NZKT00600016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb82d8d7c07e31df51afaadf8ad32b81e430bb61ce4a05213171b68d6c6b14728. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NZKT00600017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x426f743f7f2af89b16c84a4230cc54c7ffb6a44843e5a887ac1514ec5b640ff4. 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/USL4Q2061901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda1353529b207f4e7098fd23abae2f195acdb3d126fb8e471d5034945f622259. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NZDI10900034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xede65157da2893ee9d0710241d153f746c77db813d9a314d2b5327fe40bdb226. 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/NZDI00600312.