Utrecht ( ; ; ) is the fourth-largest city of the Netherlands, as well as the capital and the most populous city of the province of Utrecht. The municipality of Utrecht is located in the eastern part
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8de61a7770dffd6494d4f7e9fbdf0fe3ce2bc6f5c1ae61855739d4964bcbc75. 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/0784154c-3437-443e-8aa1-8e4f0fd53dc4.json and https://artists.proofprofile.net/proofs/artist/0784154c-3437-443e-8aa1-8e4f0fd53dc4.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3127fc49c0ebafc53b587a6b30434855a72886f74bb72e022bf9447e15a29f9. 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/JPPC02310036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecd7b9d3715f195f23475ad9181467b276970d863135d7fbcd57a7a9928ebde1. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:11:14Z), 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/JPPC02310090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff5f761f80ad52f166d9553ff4d0e0ce3feed2764bded094df5ea35e1e7be0d2. 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/JPPC02311168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3127fc49c0ebafc53b587a6b30434855a72886f74bb72e022bf9447e15a29f9. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/JPPC02310036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e1197a148d7b6058b52bce2b40d00a1169d278ee7530171840952bf7fa22696. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/JPPC02310452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff5f761f80ad52f166d9553ff4d0e0ce3feed2764bded094df5ea35e1e7be0d2. 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/JPPC02311168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac4c27155339eb20e1052c9cbc5d4e8833bc0d74115280f6448d71af06bd24cd. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/JPPC02311396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd3bd41fad22a02fe570f22cab54258274f0c3a710c4077849b7fadf420ec405. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/JPPC02311583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf187a1230161d102e714e183c29befce934a2de7385bf034bc27665a1fbbcd82. Chain 2 (Bitcoin): anchored in block 958491 (2026-07-18T04:29:42Z), 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/JPPC02312214.