thumb|upright|220px|Maridalsvannet from the south thumb|Church ruins of the old Saint Margaret's Church from the 13th century in Maridalen. thumb|Maridalen and Maridalsvannet Maridalen is a valley in
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 0xdc9774212f3e810f1fa7acb9b7f54cb064b30746d63f518d83cd2a90faedffa2. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/353d25c2-f5a9-4f20-8bae-606eb11fa977.json and https://artists.proofprofile.net/proofs/artist/353d25c2-f5a9-4f20-8bae-606eb11fa977.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 0x6797fa2fe1edd5a908210eee51de68d4a88c2366782861b18b5c7a94441aabc3. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/NOWAJ2104020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b97b162149b1259f351345a6d32cc73eabe659a9e70ee0836dfaf3aabe9d89. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T12:51:00Z), 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/NOWAJ2308010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbe1ce1c9b0c0891915e646fb775d02f08a079a867b95170b57aa06e385db328. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/NOWAJ2308020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe745ffac3896e674aed2d94949eb3faaf7cde3be47f8af941e2acad917abaa6c. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T02:30:42Z), 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/NODWC2401030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84563f3743ed301d7ecb7b86319ef9e17df4a971bab7e675dfc28c8eca578354. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/NODWC2401040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5b22397b51a0527a621bfe413b73ad464737c7d9f36c86bfcf6b19f4e040c5a. Chain 2 (Bitcoin): anchored in block 958798 (2026-07-20T03:01:33Z), 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/NODWC2401020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1a85ba966d9d9d8d3ae74668b445ef6b28dc646388ee52d8352d2c67b69275f. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/NOWAJ2308050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d79f3a537f6a794d61cac8c2621aa3cbf3a0ac657cf53f3c5e55e40dc4b7147. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NODWC2401070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91bf648468f94a9df1db01384ef1ff7bd4aa5c8382466709074c6d32efc85583. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T10:41:55Z), 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/NOWAJ2515020.