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 0x15c8f6e151c1eb85c21663794e89cf113b23bb74a825707a85a58914a7055066. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6115d927-df51-4aee-955b-01504368ff6f.json and https://artists.proofprofile.net/proofs/artist/6115d927-df51-4aee-955b-01504368ff6f.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 0x13b670b5c2fe5144353c2f63fbac75964fac3679734aa15ce2a84ba6bc891d06. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USCGH1404994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec8c2c16ae99c0ee948ca493f9e521afd3b16e1b8ffddb97b5752bf6cdba480e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USCGH1404995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b031cbf3108fee3adadc0cbc79263dec3c15a46fb94c9f137305247619a7df7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USCGH1404996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86d7bbbf67271ba1650c61121fe766f88e8e55b88bcb3ae5a3bbcaf35afcd559. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USCGH1404997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d2946746e7f9c70b6c9b463389bfcaa8d0612920225df92c21279683527682b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USCGH1404998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x535348e2a481ee9571517f2c7986f8a3cc1be065f5c679375e372bbf5aa4b123. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/USCGH1404999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54986f08cdf918a016b13b8dfb542c3917ff2851cfd811263fbb7ee8b13a60ad. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/USCGH1405000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ffd42548aa5ee9040d9f5a33cc4e3fd88544804cb22fe5cb4bd6e6967c2317c. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/USCGH1405001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aea7ffb7dfcf801c597ac38c5509f855774fadc3e22e58ada2516ffffe41988. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/USCGH1405002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x942747f9e5dc901e7fe975d5959c31765e5db44a7af6595cd9eca61a98dda4ed. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/USCGH1405003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4476001dbb9d787b738cc93b5a41fcc5aa974f6898d809c8d2545000ef33329. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USCGH1405004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b6202ac87be59f145151824b86ff1cfca35be4d1947f43a1b9459e390b4468f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USCGH1405005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bc4e709857e4325a59c90f4de11c8588b0d6fb7e92985bf58b499856475a320. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/USCGH1405006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa99be5ef7cef8998c22d0f7e494b852ca084090364cbb1c22714ccb93dea00df. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/USCGH1405007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe33036692d104c1c2534ffb612f6b45c3b84e072142f3a810c04fb461147a8aa. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USCGH1405008.