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 0x0f7ab0785499ea3297c0fbb323c03941ba175ecc71a9e401431923f2cb57f393. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c8105d18-66f5-4c49-a40f-24ee0efb8699.json and https://artists.proofprofile.net/proofs/artist/c8105d18-66f5-4c49-a40f-24ee0efb8699.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 0x4e29e829f0e2ac89c8b41f33b4727aab3beac612776d9bfbcb309d1f0b2d41f2. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/TR0280603275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x443c32bb6b603d04f53db6076cfc32297dd8e9444f52e50db549186bbdfd4ae5. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/TR0280603279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x136c8163abc8bd4fcbcfd8c795a4d704ade2620116403743867393e66cc8dffa. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/TR0280603283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8190449b3835963dc0ca569bdb0b9f28a37c9cc8c52293d1389a53f8908c5769. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:04:14Z), 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/TR0331510100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3de1046ac11e652c4ae2ae24572b7c1e587994582f0b6b3ba4201dc8ed24baa. 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/TR0331510101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeba3ffda9ffc3c65e8736a245752d876e78f0651eb8233312c1e39b8c3ac2509. 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/TR0331510102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde60fffef420d8649853d9490de2a9ab0c574901dc400415771b50f5252c480d. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T15:32:08Z), 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/TR0331510103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94a0f7e4e2176aa6db1378ff200642eb048b756e1aba5d4c03f9a62471d7f47b. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/TR0331510107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42c6f74ab33e15c8dae9393dca27c1557bdb074c20580fea7430621f11acab8b. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:21:03Z), 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/TR0331510108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cc89df7c618a6ec427c8f56f06801078d1df0f9e3be129088f49ef7f98c17f3. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/TR0331510109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91c0e67551279e6d91219beed757153fa795e436bdc4cac27163e93db19f9385. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/TR0331510112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2f52fc6a0e192f4b61dee9adc916520b361bcfd08bc3729e2d2f4ffdb6f734d. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/TR0331510114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaac4cb065e4e68c8a5d3ebf5fe2f2cd09c48ef7e198a8d3f85e884c971e9f6a0. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/TR0331510115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1778102384ff88599cd588e996e80b5b5e1fdbdcf0055bbca4254c9f597a1b2. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/TR0331510116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ecf428a9616e1222120d017e5b28978ee2436b9550b8f2f2f9643c3b85c6d7. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TR0331510119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dcfa096a0c0a5cdfe3b35f58d959c2109fc35e7fa88745a0c13e5704de68a18. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:49:44Z), 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/TR0331510121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fa3f64bb5686f7715b6676eb64ed6ed3c87303394aaa0504f319905bb8844af. 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/TR0331510122.