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 0xd6d6946bbaf4143380d800a7ddfa45bd47efc0f840157eca342bfe4890b95d4d. Chain 2 (Bitcoin): anchored in block 954569 (2026-06-20T14:36:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b0f21f67-b69a-4d79-90be-87dca232c489.json and https://artists.proofprofile.net/proofs/artist/b0f21f67-b69a-4d79-90be-87dca232c489.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 0xd347b47a4fee6b60ad6eed0a857df1c4c6c7de39956844483c065a75c6d62179. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/FIMGM1500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fc7a9420f994a152f5069d1f800a378d30d3e49cb33d4c051fb05e1e6f6ae6d. 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/FIMGM1500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6821dd615e636db5148c90f0a392acad83ea62b4b607e8fe457906b238a21a2. 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/FIMGM1500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb71b9441bdb0e826bdc6816a4dcfab5e452bf468459f6599cda73b69689cac5. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/FIMGM1500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x745c7c9314fc4945fa071f6a67cbab8d9ccd305108e326e7f1d657361601a4aa. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/FIMGM1500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa3bc19f45c9aae86816bf719d639de3914da1ba6549e9f37aebaab475c60f83. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/FIMGM1500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa629f875339c8bb07cfa6197d32aa535e152c0e99b35c15b4d4ff4d16e962ab7. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/FIMGM1500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa063e6686cefd550bd03b39f499840a4d3a09dd5c66ffab8948525877e46a59d. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/FIMGM1500013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb9c4f86d02db0c89fed38b30ed6d710b9374bd07c8bec4c6dafcaec5bf7fcfc. 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/FIMGM1500014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94c3e4dab574fe3350f5dc594e18e8cbf719d12f26d23c33e8ae5e65aa0ed7a2. 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/FIMGM1500015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf65c55de7d2cd2482742b6f68af11721f69c6a81297069dd0f398cab41bf19f4. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/FIBAR1200112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ae31ba129d2078c73777e8855dd9fc047ac645b2c8118d33129b9d83798bac9. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/FIBAR1200152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3f77c67de9f530389b55dff79f1729c2b46bd07d9c78e96a2fc4484ecb3b368. 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/FIBAR1100123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb51db819034f297abf63a81e0844ca1aad8e9bb693306efcf100cf673cb449b. 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/FIBAR1100128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x974997fd5a28b19ae5864c78fcd83bb415fb8bb85da3f54a752665720e19b43f. 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/FIBAR1100131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x724fbb658190c40eef94e470be8d56888b74c15e394d86f7ab948c66bc202517. 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/FIYAM1200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x843ff344b338a37232e1901d7e9a93c468810cc4679579ed72ef7b74c0e1a33e. 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/FIYAM1200012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33f42af0b0ea26c0bbef459784390a6e813069ed2c468359a94a88ac7dc1334d. 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/FIMUF1700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af25a0b88d4be61389b3de4019164574d1c1c14df649351fcc3e4d710182ba3. 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/FIMGM1300040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32cc84bc730d19783cc1a27e9223365c5161bcdfc0a7ba45516af3e377a88638. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/FIARA1300070.