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 0xb0bae94a32c86579177aad5b9d6da08fddf89fc78b455583a2895b4e96d3cb86. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/47694a05-3a85-489f-b140-b18c0d034892.json and https://artists.proofprofile.net/proofs/artist/47694a05-3a85-489f-b140-b18c0d034892.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 0xe3cc5848ad31b4371998c3dc491b4351881fba34b5eabf2e16a4493d5971555f. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/NO33F2313010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49efa12a74dbec30382fc16ac260c0e360bd9af7f4f5fbf70245dc889bc1c1e7. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NO33F2316010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5680111f8e6bbd54f67a59bc454c6273f3d39520e7eee1e37d16f97c4a0ff62. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NO33F2317010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a20b6b408ea52b3ec0b70161fcf810966ecc4b4b3f03a1df1ffcc184b792466. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NO3342405010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd83ccdfa33eb4d1d985eab5a9fea7ff6de9bbe36a2c31c4fc614d2045659db68. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/NO33F2409010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefbcdf47ff7dd46bb5cc0860c339e2f2c0d7303c16d6cc9b9629f8aa86cb1bf9. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/NO33F2410010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb2a91b04a21ad98e3ed2553d3323f7b72a1302d330aa1e8886fc0106a9b3475. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/NO33F2408010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb55bbf374f7135725858bb05f6311edaa355753830f904d115caac2ed109b673. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/NO33F2412010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ee230f9a063fd4d7811ced8652480288c9ecc4caf9dcde32d79cfae71e5082. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/NO33F2411010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x858e44b1568babe71132aae1d22b9a8d0e9899c447394979434a46696165aff1. 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/NO33F2413010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f5cef33b23824b3a444a834448d310772e0c2122d32f774a617af517566df55. 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/NO33F2414010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13de54e369a983750071d78947ec836763cdd0afc930ef8649faf63dd7fb4ddd. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/NO33F2415010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b3b88365a071041295f4b03a2abb2568e349fd165792cc74e7ded59c814f5f1. 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/NO33F2417010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53f7173d10f0a82663d8194efc30fcdc8587438965c03e9e7859e671234062e3. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NO33F2418010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64ac2c4cb3e24054e0ee3902d0ec9b46fb9bafd37b56812dae949a014dc39c51. 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/NO33F2501010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6520d3e75a5349c16ca50d45e5ae0794a585b0a2244890173d7c8d5c3062c9b3. 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/NO33F2502010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca0f41699a4d6403fc108ec7609bb2128ce1c5bffe9ddc7e0e0ebefef4708af1. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/NO33F2505010.