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 0xfa27b44fe64ac572b9ca2e55f17630966c54dbbb086492d604cab5df072370d3. 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/ec0c5c8f-ebcf-4f3c-aaeb-644a4edc7244.json and https://artists.proofprofile.net/proofs/artist/ec0c5c8f-ebcf-4f3c-aaeb-644a4edc7244.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 0x83bc6d7e8b4635e62097f6b59ef232b137028365a75502c1acbf7c17b94167b8. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZNJX2444934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14e573277df63ddb3331de6f43de2101392415f17f112457f6ce0d186b0778ed. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZNJX2444936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e6a7a0e2d74be23974b9ee2c59dda577098b5a2cf2ca4413a88038a0a3ea20d. 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/QZNJX2444937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f04b87068a7b5df1346487bda68aa9320bf5586ccc4c70a3a72107974af5eef. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZNJX2444938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafdbf7eab7dc85ee3fafe2de9e0273d9074009ff1c43fb0e99f2d235355e0b8c. 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/QZNJX2444939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e61dc274776380ce5cc7da34a640c85d52675649060f2c8a42382b65c04ff61. 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/QZNJX2444940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x678cb838dce67daefb2c846093db6fc2bfbe849a0d9ee4fd03eb7d530446a915. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTVM2403668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x420b8404c1eda2391ab9843839d43005c65dc87369fc54fdca06c0cf3e73e6a5. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZTVM2403669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d4b0469d9ade8e07da1bf2097cea0f7cdcc529702b7df1768c7980c71fc8444. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/QZGLM2534597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f5012f5cfe2a29c36d3927c41bdff21aaef67d3c5b52da2f0b5fb24dd1f0d44. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/QZGLM2534599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca5d02a902d90c255c7af363796993d11cb467ec1d337b2a48c16648c0053a5e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZGLM2534601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x518ea3095a0a7fa95e989a50551ffaa7c825ca66bcdee8fb6dbd663071d90c57. Chain 2 (Bitcoin): anchored in block 958493 (2026-07-18T04:34:53Z), 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/QZNJX2506632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb3ea4f1dc80d71198ce3e6fe3ef3815bfe883d5e190946ff96e0a8f84b6eebc. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZNJX2506634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x018ace5fcb3063ee311f6d32d969ad6445f6a92b4bc0ae2796c6dc6ed3eb9b14. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZNJX2506636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x159e1cc41c7ffced97b5eb8822ec3079f68122df0381cd0ce9793cf09c1d511d. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZNJX2506638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44fdc907ceeb5d95d40b387550a47c114c23ed7831082afb3085832af874ff3e. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/QZNJX2506641.