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 0x7942ba34c18476e8542419c3df76c59502c8d1e506e7dc64e6868e722059f1c2. 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/295e611b-5ba0-428d-973a-36030306b15f.json and https://artists.proofprofile.net/proofs/artist/295e611b-5ba0-428d-973a-36030306b15f.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 0xc07e4214419d458b24cf577cfdc4d536089fed1dee1581ba8ecbea39c09e7b75. 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/QZK6L2090740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf494abb6cb8320c7a96054c56464bfd3ed05a1102d902799e2b088c92f49f4b5. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZFZ22174807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c937c2acd3280d3f3a3da55d65c845fb8fe329aef772be2225da829b0405a93. 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/QZDA52116582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x546ec1abecb70288a7702b2084a47b4a0638e0d43f1f0d27d0cf46c048bcd4be. 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/QZHNC2150675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3cb71eb3752a12ec8e660164e0f5d0d59cdcfb57d43f336674df92486ec4791. 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/QZK6P2165913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78c7de71a6104407b66ddeb4e73b945c8a76acbe10939940b68e2666ce8028fe. Chain 2 (Bitcoin): anchored in block 957867 (2026-07-13T14:55:20Z), 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/QZNWR2100437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc174c5e0371e8987bd47272773b8d16697518fd16c6bec12d5cd4f2180cff2a7. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZRP42152317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d0a920893f9c5c6a1ba80121797aa2fd331b5ffa01920189297d6c00b55ac6d. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZNWY2145024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a9977eb78d7e4c932eb6229837de7f493c3015a10ef91355ab71b57d4e9a907. 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/QZRP42152318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd1f010e8618466051f08e1241caa48f1ac2f50cfdc7b93be65b641749c6a285. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QZRP42152319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc0eeeb0d086ddb0066a4c4818feee850512d2a6a7a21b4a61743ec3201e0d4d. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/QZRP42152321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff7152e687566b16b6204c1ee082219402ac65b3a714f9ca8fe72709223bf888. 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/QZRP42152322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7370161a68e3826d45791ad1a0fc6351cdfba0699ece75405b0b34b05187ff8. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QM42K2209699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e49e17758971ef00c23335d145c410db2ebfb95f482d065cb79ea4dc2cb9384. 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/QZK6M2243532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66161294df8155f8fcb97f2c422928bfb384110678d9ec931f571b030973c67b. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZPLR2228272.