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 0xe9278f11cc265e9c5d3fe716ed47266265e2234b416e908120090303b817dfc1. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b5258eca-c7d8-465f-ba58-e99312444892.json and https://artists.proofprofile.net/proofs/artist/b5258eca-c7d8-465f-ba58-e99312444892.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 0xa6a02edd83a0cd66432ee3c9f70020294989926a8a89f2bc1beec58a94445098. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/TCAFG2017202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9089e6777aad40d57f01cd77a9491067ba9f06f82a980aeb493c1d67dbb78e72. 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/TCAFG2017205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2411612923389f9abb0f2000bea4e2a8b1e852983b8fd451067a563ea717e742. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/TCAFG2017207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ff088c06a2242b905f4bbfa99d9f5e40afdbbdb560c7d48b969abe3ca0bae4. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/TCAFG2017211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf69143ecf44927ab09e5e6c013ce25c9f1ef6f2987e69b4b09adac00bb2bc97. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/TCAFG2017219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x334e3d5c636175a5d1ea5d0df1d370c6bfcbd49579dc89263821dcd5cb423af0. 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/TCAFG2017222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8af0557832b09fe3b68861e2f45866bac23b8b2473b4217273e58df38d3a8638. 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/TCAFG2017229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ae93a548689452c03fc993fa949b702da0f6667c52c4a8de8aa153bc2948c67. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/TCAFG2017232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x083fff1df5add2459607d9dad0c74a8a872676f009e3cce206154c378c15a3ff. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/TCAFG2017243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x709fea35160349adfa6e2296ecbeaaa482dd7585c860bd788bd8bf3f20eacecd. 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/TCAFG2017248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67b27647cb7bfef4a54caa1b6faef35e0f45f174d8433f2632f03b77edf816d9. 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/TCAFG2017255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cb333ee00e875b91d45350cfa333f11571b1a75ced3ca90265ce505826f11dc. 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/QZNWY2239958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dad4ecb13ea8b5ed1618cc60eb576361f906f1662aadb18f15c01c2eeb04ac0. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZNWY2239959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf389f9e502466c9c0b9eb1f7e7c6fe0d837c79c3d88332a0622648ed21cdf6a. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/QZNWY2239960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87b7c247f69528a26d794dc584dd8bc9dda9cb0955de048a1da64bd4f3c00e49. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/QZNWY2239961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0e1c377b1a9c9d8a2defc9342edcc57b011412a482b3474f7f2eb2185b5f5d3. 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/QZNWY2239962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x133de1b09ceccb0dfb530510a34365d5f2d0e3c1fc93617669fdc0a5f6c6aa2d. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZNWY2239964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x220c2f7c5f4d1d2ca919387d86503efc9ab4cce45c5a32ddafba2238c9cd8d06. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/QZNWY2239965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x052041699eab01ea22e5985d6d6a939f214cd6c408fb0089e338d4c0eec20c3c. 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/QZNWY2239966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa256c6223e5ae645c051d6b39c1955b276b0c5a626ea342ee5754139e9da18a6. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZNWY2239968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff54ea233a2853e292919ad77826d33458c3539b79bad56205e17208793d5343. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZNWY2239969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e33b91b38404019094f5676a28bbc6bed442f30b4ab22502eb56962588a7509. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZNWY2239971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63a8fc80c8f27705fceb7da89ba1db5b5be897c5f453e548dfccc9558643e2cf. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZNWY2239972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46849ec5ed628c3022becadfb61bedf35c32b6d7867c5a3a4343e63e6c3a7296. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZNWY2239975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed1df05411b525a4e6401a06f38188268114074f7330baffb80f38fc33330153. 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/QZNWY2239976.