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 0x0d7e17c466e8def7ca32a29e6043f98e8965d0daafc612d3b8cee451853394b9. 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/df698bc3-2823-4307-8797-c73f1f1171d0.json and https://artists.proofprofile.net/proofs/artist/df698bc3-2823-4307-8797-c73f1f1171d0.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 0xc775df0fdef20646aec5f9c7344f4cc1509375e50caaad1ced87266820e44f5a. 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/GB43N1900041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbd729c3e9647be69bced16bfa0cc7b0689698d325589a535dec39369dbe65be. Chain 2 (Bitcoin): anchored in block 957526 (2026-07-11T06:03:28Z), 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/FR10S2112546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c2cf88e0959f20df158a6618d8abde4652f6506aeebbd50da64a3af8fef4c06. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/FR10S2112548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c358c482525846bcb5180d4462d26b3f92c00fcbbececdef45b4d34ed2acb40. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QZK6K2252511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae3b7732884b1eead59a753afdd62dc0701a6c6dae1a20e20fdd2823aae0ae9a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/UKXN22215306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33607f1f4e3beef83e0e33f850364908e4eba4a0b2458d6a0887974bbd0a21ee. 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/UKXN22272419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea1bec8db68cdd4128e44abfed88c2cbb6061441f267ed6b9fc7385b401bc41b. 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/GX3Q92338751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfcd3f00cfde2a2c60283d110c0b477f6c1dc00898cb7c9966cd5c953e1d26c7. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZTB92334653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ce882ed6ae27f15269e40990702caa19bdf70106bc5f3ad8f9f615e123aeaa2. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZWFG2325430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b698e5b7a22b2414dbb62044e54f5234e925b3d0f7f8651c25f1d7cbbe036d5. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZWFG2325432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeab5f015e1742e21b3a5516b170c4b865af900ee7bdfc5b43fd7e05b09ba6779. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DGA072471079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd05d294dd1f4090f6bcd583a301274e21031c663bf45804929e29f4bf1444e57. 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/CA1C71800225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd05d294dd1f4090f6bcd583a301274e21031c663bf45804929e29f4bf1444e57. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CA1C71800225.
Black and British (feat. Little Simz & Benjamin AD)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff6ca85c8e608200aa7783d00f5167b71f9c9e9d88432b2dfad2046eb6e1fc79. 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/QM6P42479080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff6ca85c8e608200aa7783d00f5167b71f9c9e9d88432b2dfad2046eb6e1fc79. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM6P42479080.