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 0x153798a55a052ebd5456806f2d02321f50332ad9ca919cde57ceeba7363c953f. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/031ebafe-767b-4b10-8a1b-4028de12d441.json and https://artists.proofprofile.net/proofs/artist/031ebafe-767b-4b10-8a1b-4028de12d441.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 0x851c48da4b087c8c5bff8f978a14589311e066741cf42de885ce4f4a679ae028. 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/ISZ981200231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f412aab06e94b8c89ae0deccfe062a374f806a86f807c4c657267e8a7082d6. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/ISZ981200232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa374eebfbf1dfb5ea9e3299e51c51934b23fc2be630d0a8ed8f3652ad39e6c92. 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/ISZ981200233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c22e602751adaaf19d9338252e74b818c1e0222547fbe73840316ca28fd80ef. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/ISZ981200236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x623a569e3c31d41de518b184ab65fa08a8d9f676e1e1d2199e898a363b86b901. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/ISZ981200238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63eac535bedaa80771d052268337846db26b9ce6c75d8f1ed0d83e4d7ed39403. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/ISZ981200241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x764009249b6253fab1eb95489e04bcb3e82b3466c54828f386711ab36d8a645c. 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/ISV440904401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe729036c1d31fd965d4ea5638640f09dac443ae6133b06a1ceaefce037c8d4cb. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/ISV440904402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad8e1f4112e43dcfd20826251656521cf186c90198c4aa673ac6c45255e28db5. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/ISV440904403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x345171951ec4ba843bcadfc22c429793b48725c69cc36cc3239bd7d1e7ec299a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ISV440904404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd72195420fbee8278d681cfe4d0a9d4621a4e6d96407dccc2c377c0733f8165a. 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/ISV440904405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdebde83c6a1b0a21fd97540ead78d11984025e1a0a6069303000ec61ae886d34. 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/ISV440904406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa46e94904f976a842b9bf999769139466e8c9cc91510cf4cce9296886b77423a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ISV440904409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c0b004b43a852befeea9300ad50ec1972848edd40a2067713bc6bedd6e005bb. 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/ISZRU1005490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25b473816bf80b44fe5acf667693d95f8e5398625b1cb86b21ea94ec63e69632. 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/ISZ109100704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0feed6a79045b888af15b084c304fdd7ae74c65f2f4c65b198c3521705daa1d9. 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/ISZRU1005486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ab4b3a0d0f9a607e41f7b59c32ddac26208e24490a4365548756cd1fad246c4. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/ISZRU1010939.