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 0x465e248bf69bb06bb64a176ec7582610dd5d4d424d7a021f077d4aac96f70314. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5507a1e8-0f4b-4a93-bc05-dd4880b5d871.json and https://artists.proofprofile.net/proofs/artist/5507a1e8-0f4b-4a93-bc05-dd4880b5d871.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 0x4ccdb909f97515b696098eccfa2fd509aae53299d74c1042a70a580b20b9cc4d. 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/GX3Q92390824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa1c916da526981ccdc47fff54b2eaf703739a3eb8ad977aa651bc7762989078. 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/GX3Q92390825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71aca0fd62ecf0b5d1553f78ce0d88d97edecb1db1a6b64bbbd04c4dab8fd0cc. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/GX3Q92390826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6d05ed42037600e4077ef37255cc9f57226d9d482680327679e631cdc1fd05d. 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/GX3Q92390827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca02b85764faf97c361e58ff1ea02ab1334a88773214fafa2688726551a20d6d. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/GX3Q92390828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x628145ead6d19f8479361911304dc1dd249059fb9872de6f9f76ac474ab3843e. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/GX3Q92390829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x095e22d970d4159290f43eeef726749c5c5e02d4504428f3f125f04ddceb823f. 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/GX3Q92390830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0733b4f2daaec89e8875ae49a38c1cd99c45a2782f2131df0ac1609313ba18ff. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/GX3Q92390831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50413a6b29d7b8869762d40ad855eca7c659a8eecd3718bd3875add5294bd4b8. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/UKXN22544433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x103212cc5b0360f169e58f2c7ad77db428413e9dbcd3e1d26e2859a2d1962ea4. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/UKXN22544434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a42c290409c6c04f64714bb2791aa4822f8ca606b4e4359487f541e491f3f1c. 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/UKXN22544435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6abfcf0640cd9b9908715471739fa3c7c0bef8153c0693e5e0495872f5914a59. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/UKXN22544436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadeb081cdd9622cc6f7eae4fcbbc905e200111345e3b5cbf1e83786480fb2504. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/UKXN22544437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc6f2b86d843e23ecfd7f34c7064073c64639321b235744e53abec92dc5101ce. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/UKXN22544438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fa5719f9a181367a0f79e5ae7e9ce0ad0ca27a9cf0b436af324ebaa390f666d. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/UKXN22544439.