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 0x7b90e37738b38af2519a261d1918f8f2cfe585f82796f3316809f134f50194ed. 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/ac0421a8-78b0-460a-8c7e-c0ef6b9ba40c.json and https://artists.proofprofile.net/proofs/artist/ac0421a8-78b0-460a-8c7e-c0ef6b9ba40c.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 0xab935457c6102128bc2e8b07bccde2f779c58495b6a58b09a264a23d5e228c33. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/NL4NL2207263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x010d6df3dc353b1b075fe3b6444631e4d9c2151d8cf04d6e1fc8a37eb38a33a3. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/NL4NL2213339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0a346e7fda191a495f2361475dba287642148186cbed0e48a1231ce907d21a3. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/CH7812222245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0e59516eee1e78a02e3b4494dd9b33a04ef7d2a420503fe8ac78e2842407f82. 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/CH7812223983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75236879f715c794b684083ae2c745582499c7eeb44ee279a41e0f015e2e0068. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CH7812227223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dbecfbda42204e37e3cf82dfda252fd99f97d512df2713939c14f0fa0444e61. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/CH7812234179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3b6aa6d6846c4e3c09aff84f6d3da7ce99275c829da036deb0932178ce87a6f. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/CH7812236036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26f31ba507195a2931a1f11ca63eba289e32ed575f7e3eb52d2ea79da97679fa. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/CH7812236039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75236879f715c794b684083ae2c745582499c7eeb44ee279a41e0f015e2e0068. 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/CH7812227223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61523a123dcf5e1686e4e80251bca0f6d989ff54090e13cf32ea600bbe243bf1. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/NL4NL2200810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f1dab357b09f7aeb46e1c04a8d5153c76df575fe1dc5a85565027ac0379d90. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/CH7812344938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66ec94784c72d4477952c4f5ba1e7e54d667039ab506f10873c0ae4090587a1f. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/CH7812346452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b41faf82f9f10ed9ee0bc66f4bc23271fdbf04357af9bae43625a9e0041b027. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/CH7812350743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66ec94784c72d4477952c4f5ba1e7e54d667039ab506f10873c0ae4090587a1f. Chain 2 (Bitcoin): anchored in block 957668 (2026-07-12T06:54:37Z), 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/CH7812346452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83822d2f8b58d5607c07b6da9e1601eec6a8cb96b289a7a6a5b6714a0218ff9e. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/CH7812354002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26a2fe9efc54c9626276f39b02357a7802b6e00354af500b9c7cc185ec63723a. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/DGA062346187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d78694a161a8fda8e460e53be72446035473aa94f421771e9ae16de042fbbf. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/CH7812412192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59443fcc3dfe046e71e90cb9b14d2e8ff4fb3d9e725c6aad9a50696821ca0243. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/CH7812413316.