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 0xb026474a23e8909d8530fa5547885549040bb0acc13d3b27a0a4f6fed9a9e91d. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fc0d5b9b-c9db-4070-9bcc-b689774454b0.json and https://artists.proofprofile.net/proofs/artist/fc0d5b9b-c9db-4070-9bcc-b689774454b0.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 0xadc67b3248542a14591f6a4a412233110662f54a8b8628b897758ca6b5b57d51. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/BKJH72500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18477cbf958d6bf0e85fcca2d0f59d08e7db3643fc52809415047ab85604cb77. 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/BKJH72500052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a055e1ffcd617ba9a71618d1e5a5a605f39df849726c714f244e978f1922971. 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/BKJH72500062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b314ae55f92e8303060f77ead7f3bb2f7c76fcd559706f4edb95b04a9bf66b2. 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/BKJH72400153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb9734eae000b0cf88cd2018d012359331672dfaf2c417736193097b05071003. 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/QZTVM2464199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a379f8ee6bf150e91550e2d0d19a46e66fac79e6bd8a0f4ed034d163b446574. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZW9M2464483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7743d488724901ffc0f092e78335888af1e13072a1cfea6755c83c93b328560c. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/BKJH72400130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x247c239bbf7f0c98192f80a6ca808ab045673ca737880f04109df43a03cdfc0c. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/BKJH72400093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xded9c35559ae55c9bc718f3274780d53e7ad8802a78bcd9e4afe0ffa138bb9d0. 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/BXIV82358464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c41659f8eebc75d9b234c5b1017dc74f3dad34e63cd47725b8a463ce624fd02. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/CAENV2522916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x426d80b066ca2989780e2066ccf9fbee0e454cbb73c40d7fe3c430d9924fda47. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CAENV2522926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c7e6f7340cd15b3890f4826ddb5a27b66d7387e297a648a74969b2bd5b1d980. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CAENV2522924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63aa96b08f47eddccbf76b911622cba35acf6e02d146a56f92dc457a61e3bb16. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/CAENV2522928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3d56fef8a0e38374c8444d2b7e12754b154fc03ebedeab3db645731c26e5f90. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/CAENV2522911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef857f2c90fe7de546784c815a79c9b0dcb7993fc8fff94c8dee0d0f448ed9c7. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CAENV2522925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fa9b784555c9c8a532c1e1d7b68bcf9fbd4a3c58b6720d6d612ef5b8cd66165. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/CAENV2522917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f89c428c32b6f15570f224b547a9e0cc200d5638d3398b820ac22815695f189. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/CAENV2522919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8cf4985ad4a2b9a7609f5cc9c0dc8976f252ece8f373d51fa79a7d7ba15e8dd. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/CAENV2522921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x079ce89723b03e0f5c3261c7c85a65f7441424e3e1ed91e887e2a79d102b9fbe. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/CAENV2522920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd60f678ae13484f4bfd74fd4252d203404e1c44692a14b8ee7b7fcd8f86bced1. 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/CAENV2522923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaef1d07873a6b9d927145233119e569dea860e250ddb210e80e7e3a0faf3fa7. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CAENV2522918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe2dbce0e6e37178340cea07671c17ee7974781fec8698f78f6bdac15d5c90ea. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/CAENV2522915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd761e0453ad39d9a253d0d1f4d6c6c8407691436e3b7aeaf2336ddd7e528b263. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/CAENV2522927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6255db1e76b8a1bd74e57dc79f5f1c2949fcb9f3aedcf845040b9ef32c55a64. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CAENV2522922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78aad8e74bde14682536c5d9d464d307330a4013469d41d76c9dd0d6f892928a. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/US7VG2341784.