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 0xdf1273cb9208b7f5a4226400f3790d462374f0009edd9d544ee92a0c605a5123. 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/f87ef8a4-542d-4c0f-8992-60c35501b1c9.json and https://artists.proofprofile.net/proofs/artist/f87ef8a4-542d-4c0f-8992-60c35501b1c9.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 0x970ca1787a6b9d9fbe2ec2fe6c27aaeb4ed2c0a09d50806018d2a5ee3382e341. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/GBLLT2354766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c5d03704768fbc1e6c4ca2cf1aac22c6b4d3118c1f35a398c2e9f167d1e140a. 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/GBLLT2354768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x410146b4cffc79f8e3275d14612a597265b09433b849dc0e305e35d524486bbf. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/GBLLT2354771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3303e1014795ac92d5a93bd84eca41111574ddd687958f0546c3111594647cd. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/GBLLT2354772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x521e18122a1fe53f4a8f6bc3a30861fa81b94787bdf7b501724c7c85419a273d. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/GBLLT2354774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74174cc7e5702da9ff1dda731e83a579e1fd10c2e8330b91239fc3a9ce32ff91. 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/GBLLT2400751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63edd287f5e746d6b1cb292683becefb439838e288f7209e770e8838913a6509. 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/GBLLT2400752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b8023d47c49f9cfa4ba54edc1da0a0f13f1270489359ff89441d9e8b306c822. 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/GBLLT2400753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ac8b578c51260c73438bc9f361f5c38ea443c680b8f43b7aa7f813f7a2410d2. 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/GBLLT2400755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x549d78259f9c778c28e6284f7202647bb47c6d985dcfee9a914426c6669458e9. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/GBLLT2400757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e37d30ac74db9bdacbdea5da67204006886f13f0f2227951a2739e6e30f5221. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/GBLLT2406808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaaf299fba29424f70add7929eb26897832eae7d0e1dc0d1f42578d5dff77cd8. 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/GBLLT2406809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed6c8964a5996d6a4cb5e9220c3f2dc72b4c33bccb933d5f12b3a7c03c6a3f99. 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/GBLLT2406814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x526fc9a598ec0192c18f964d578c6e7a952be558dfac8a40b37b8f14927bde0e. 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/GBLLT2411668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e4ced2664b4884f220947189b0fbdd8d0a91760ddb1b869efc0a1315e147554. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/GBLLT2411669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1166d706914d0cdca8a6c7d7fdcdfcb44e32584efd55a63226032eb30181a293. 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/GBLLT2426282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53de604bb4cc258e43ad980320ff549141b94dbfbe09bb7606b7eafb9c4a115a. 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/GBLLT2426287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b7de499977d843a10c4710fa7d03626e9735d8ac7e58603fb10f731415030d5. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/GBLLT2435807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc32354c9242a463edaa7b1559ffc4ecb9e0e8cacf55cbd00c1671fc257b1f72e. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/GBLLT2435809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdebbbaa8bcb2ac41f02339d040c5bd751782a5fc2d09bdc90a735e32f4fc9a7f. 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/GBLLT2438732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x214ef05ba9a7be52ee6e5bfb379152025cab151d0404be3a1e8ee39d63f6c5db. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/GBLLT2500350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x060273704260a39e175dc81b84c1a6dd76cb06ef3864e3aac8381b2cccb58e32. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/GBLLT2500351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c722217244cb02a7809acbecf27bec9374e315bb0b5f7c64d817ade88d65b93. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/GBLLT2500353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef14f728df3946cf434f9451f6ffc74caa2f01318675c637f04273ddf2df1d60. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/GBLLT2505139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x549e226a9b4649a09e6ee80b10bc467c7272834682067e98b1cef028b406485c. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USANG2451371.