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 0xaff79c27b1cbc6875060c279be53dea1683ca7cf998d4db3e14d8c32492d4e03. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c667045b-f101-43d8-baf3-9f9c4bc4a805.json and https://artists.proofprofile.net/proofs/artist/c667045b-f101-43d8-baf3-9f9c4bc4a805.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 0x259658eda9742b446784600bb47db185e8358da9ee51d9745c2e8d120ea377cd. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/QZZ7W2402552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81d9b2b8ba9d1af56d4f34f5a272b5a4cf4ad4c393deaf6ce21f257e6dac52b8. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QT3EY2473855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a661b5a7477a65f800ddbb2bde584925215723200937585d01fcf2ff1d44fb4. 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/QZFYY2572172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89d8f79e784acb1591f6396b644bf7d132bfffd5cf91ef55bb8eb729734cc70e. 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/QZFZ32525979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a9de98c3762c08d153512d2aed0ac793c55685ba3f3bf72e8bd7b54891cc98d. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZFZ72514428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf187a97300afe0144a1e712b39258de70f96aa98655bfa8a3cf561159ca1ab39. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZDA52573866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x041148b5ee69500ca041c78c8b4ee123514d1f965f1fb1b7e62f16e0d97ae525. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/QZDA82535338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a734c8224e60f8fd79852c00273a413d200fad1f1e032cc72ab5328c8063711. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZES72544614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x048b8df85272831484089c7cff525d4362b1cc2a0677eedd87012db0c0aaa850. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QZHN52581277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797bdc42ae2b6ed01d6837b18c2bb9036558d8383c0820665459dd9603e17884. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZHN82599767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f62647c5db780ad64ae5f53821ae6ab2ff6ec93d19cd84af8b2ea635eda64ee. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/QZHNB2529054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2331c2c2c039606f8c96303714fa56c96f8ef1b79dc0234434893ed2a95159f0. 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/QZK6M2593878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a1ab4b17d0540ef7e423c9148aa05cecda272ba4e8486b0fc60df09c9ef49d6. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/QZK6F2553332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bad16e8420dda8e60f31ee6db4cb10378a5ec469cd4e1a143502b93b1ab7209. 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/QZMEP2569499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba38d55f6e70ab7ee063d94dce536e364a9f83889d62e40e15f8483578a24c3. 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/QZNWS2596756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf46b5bffe0e755f04855d98f3fee7c85a4aefb4c6ec6dba6ed05ead1c9e8244. 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/QZNWY2514855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba0d56741da39ebdcfe01e99dcebcc43728df9b4f592733ca0982323eacce30. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QZPLS2564354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe4428fcd202dd7eeb7a3ff1d06b837394fbbcf08401365416708b0bbc45018a. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZZ7T2516993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2763e1369da3d0d586c342325d2b622c6785f57773e88d83ba6f41e23e8880e7. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZZ7X2532308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3dac9de17d437f995e80999bafdf922346b0447be5fb175c150f732b1eccfeb. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QT3F62544398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ee5dc3e6a0195a873b776b2137b61af17579bd89d32c069dab71598fbb35ce6. 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/QT3FE2541755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd9ee3196dacd099d06210b32ef2e8ab55c0386da77577d0c573d82bfaea244. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QT6E62576552.