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 0xe35c8d34dc2c2ec8d6f580e1c028164f5a92e05b7975c810a39125ceac5dd965. 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/23b86472-8668-4238-bc2a-78078b5a0a2b.json and https://artists.proofprofile.net/proofs/artist/23b86472-8668-4238-bc2a-78078b5a0a2b.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 0xc855a35ee8b2003f01f966428db5c7019e9551467bfece54f52a7f50d8356ac8. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZDA82136813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e59c54921e7cc7c3987d733a88a6be0dc3f24b8cc7f2eac1ce6e541eb2edeb8. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZNWT2130763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2de5364f3e81fd685152e2fd5b4585148a30a93bd1790448208794ea3d567254. 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/QZNWT2130764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1204a6e75f8fe84dd10c5c416c27c56b9b54cd73ab0e24decdc4eea28f844e3. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZNWT2130765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50d53c12ee01f917923d8ac954580f60288a23e30749280e71712c9915345b06. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/QZNWT2130767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92319ecdc9e38d18bd59401448c25706d9dd32b6b14c6d343b8f7eb7088815ac. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZNWT2130768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x613c3a775687f6e2ce46f8d7adc99364338c78339ec1127bd8fc31035b3df643. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZFZ62254869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e6f60a2ee46fde9919c381723415b8754de88d68062a411499a85445857f902. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZDA62215276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x038daf8f874825c2da37488cad3c2c9457be660f38fb4b9bc36bd3c3c6cd74e2. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/QZES92226793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d1b774a3e0bf672405ffd48d42212772031d15afedca486f070b6169418de1. 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/QZES92226795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47ac259fc9cc0e1d66f431a1226a2dab1461f557a5c07b3fd19101102072b1f6. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZES92226799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d2a34d46e4f91f2a2ae0b8dbe6e691b2a07dd912f8a3d527407e57c63bd01ea. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZES92226800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fb8fc791e6444a5bb52f18294e444801452ce86a68fb16c024adb230682f969. 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/QZK6J2238918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8053e92d80a343b26bba894d619dd1fb7c7c454a48b2238c1ba81c6d7423d44d. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZRP52290789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb339e2120fcd55dd7b8a380d42d96ace8d7b16f74c51202a39d2c379e8156fd4. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZDA52323920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ab606a819607f57a069e839a3bc941cda8685424d2ca2472383633b18f5bfd0. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/QZFYY2406970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc201cde668ab3edec86f38837b068287293043222d11bb00d5b80551e7e9ec13. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-21T21:45:32Z), 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/QZFZ22419479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaae78002f25adac1e6f4fbe95cde75590f53ebff439a59df06aa6eb6b2ade8e9. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/SE6HN2408838.