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 0x58704bc0b75bac5f331a7d0294c78cc1f9bd7980d9d573cb111369cacc8ba592. 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/f9a60332-038f-452a-8599-b89110a84154.json and https://artists.proofprofile.net/proofs/artist/f9a60332-038f-452a-8599-b89110a84154.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 0xf9d979f7f5b97f3a59426f32dcfbe0e3e5f1d3ca95ae7fea171fc1a6ab7d48f0. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/GRE017500222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18e190a83752915e8e9ab7681c36ec1bf9ba91e182291aff1d22c2edc272ae73. 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/GRE018000124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d2c33657e9d689ad9d99e6e1a426e4092f04ca9eb5fdb258bb7ae5cd8eabbd7. 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/GRE015600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87defac76d7ff5170962a04adad00d33d582bb1f154eeb79e42ba18a5bcaefc0. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/GRE015700070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6013ee94b4ab473ccc6277c4b9bf8e9e1ab51f46f9918a9f193473ab5397b318. 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/GRE016300184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaf1c416bb5a7386d33ff039b13231f637b72d33e03efee6e52509e02a7a778c. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/GRE016800559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44d0b439e6bdd3bfc51da07f467cd58df0709a13e942da49a79732c9bb0267ac. 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/GRE016400155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x249a1c317289330397d0dd054ce028bcc8a9ec8a90b61daa4e8ad613e12ba654. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/GRE016600853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb40b2c919499cfd9c38de22c4c750e46ceb3bb4bd4fbef414743172edddc9d0. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/GRUM71801269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x427ad9c7bb024d882d6cad7b9376e49d5aa4a1a6d7b6c4fb17a28ae2e5336498. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GRE016800012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ed4855fc6ea53424e08104e21e5be3c2d10b91337ae8bd01b767f8e1e9a259d. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/GRE016600227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ed4855fc6ea53424e08104e21e5be3c2d10b91337ae8bd01b767f8e1e9a259d. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/GRE016600227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf61ba36d001c3c3c4e504640dbe79980708e82b5818c41ea45eef627a87652a8. 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/GRE010400576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3a33dad0869c0ad15f97ee153b7a163661ad1ec12cda58bbaccabd951bd74a7. Chain 2 (Bitcoin): anchored in block 958647 (2026-07-19T02:36:14Z), 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/GRE016600899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f39e798516f296309b6dc70d5607e20029f1ee1edf0e2e68bf1842dc2f11a5f. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/GRE016800034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f79dddc2318101b0250005298f131f10caf3da00f38f476c6ab196aea34eb76. 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/GRE016800040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75eb293a198f30356cb54abf8f876c96b264b12b9cd8fe715e2258ec1aed453a. 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/GRE016200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4882dbc2d7409ee5dbc5121614b2e874f010eb3f2eec413292ab80482b971052. 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/GRFM19200140.