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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 0x89df58c7caaf85271500e9b07932baf3dafb94f63eb282a2394ef8162b3f7ba2. 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/0bce3c96-95cf-4413-a156-39529a937bce.json and https://artists.proofprofile.net/proofs/artist/0bce3c96-95cf-4413-a156-39529a937bce.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 0x8244e7602bd9c0532fb9b8a63dcef295f8a1cdff086c0993c61bbf03201943a4. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-22T00:52:01Z), 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/NLB259700083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45625aac66f31a0ae6f670b66aaff9419ab6700e2077a7c0da93a49ce16103d8. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/NLB259700084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5a3aabfa36898e78560137ed59dd9fe47870d3654ee5f5e1f097cfe22cad09c. 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/NL6HF2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29d9430e13e8e9f1795b1f784ca8d8bf1a6ff618ef9f64702c927a0b5fedb65c. 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/NLA240301167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d28e54a7838d338e3d6bef91f3ccf8a53f714dbb931350cbca8e7a5a471faee. 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/NLA240502721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81945c3afa2f90c96bf8188896acc9718ace068ba2678f3fda6d307bb703e366. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/NLA240706262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a54d506a1645ba234a227856ad0d8fb354a1c9b5e982cc44f6295480f3a08c. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T05:05:56Z), 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/NLA240706261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba217f1942127107a964aa68969c9b79f07f7d77400de5118f74b644b2059f40. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/NLA240706266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x091639d0e71c229fd010fd53aeea18383c58ed3a38aab8cc36d35899193648da. 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/NLA240906898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03ece5a36fb562d4d397b3bd43bca84a65b44aaf8c6df34d86b19ac48ba88a7e. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/NLA240906899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed2458dcbb45d23b4d118ed715bc99b4a436e23ea9481492f5972fda279bf1af. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/NLA240503766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86e425b18c33b2232aa09891a8d73c24c910029efb0acca5a3646c45a10779bd. 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/NLA240706267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29d9430e13e8e9f1795b1f784ca8d8bf1a6ff618ef9f64702c927a0b5fedb65c. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/NLA240301167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x729f3138ff981de8ac8afd6b22bdd9414e29bf82e442e959ca5a8eb3d3f05401. 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/NLA950600411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9c20df80bb694e0dda50120b76cc855b2656438101aeed1e924aabd9a8a9791. 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/NLA240907168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x348d19812dfcbe5665a7b49f12448c2ef1e0f990e0f2c40a1c27b43f32a1df02. 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/NL6HF2300001.