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 0x47fe04fe7a8c1529d217e50ad74ac2b936d0b826ab862d653b5e16a2651471fe. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/221a3835-8c66-45f4-bd69-40797529c54e.json and https://artists.proofprofile.net/proofs/artist/221a3835-8c66-45f4-bd69-40797529c54e.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 0x96d6052219d2884bd5fd8432229b7b1e32b1a27aedc80ac912affb3acb45f70c. 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/QZMEQ2280985.
Las Piñas City National Senior High School - Talon Dos Hymn
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x066cd9982aab1293f50ddc3c0e26ed6369fdbb46541b970a8dac5dc26ed01719. 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/QZMEQ2280986.
Las Piñas City National Science High School Hymn
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83404f748dbc726ee7b1f96d2284903f43c6bd8869b06b9443d69ba574f56d5b. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZMEQ2280987.
Himno Ng Paaralang Elementarya Ng T.S. Cruz
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ee4038fc4e2fc7895e4b6f03f8f97b0459a04e62f98cebaea93ab629b28ced3. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZMEQ2280988.
Himno Ng Mataas Na Paaralang Gonzalo Gatchalian
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x817011db3765f3c9da132acff7cc16b204f51dcdea6a7100ac8f5dd2441db7f5. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZTAS2386768.
Himno Ng Mataas Na Paaralang Gonzalo Gatchalian - Instrumental Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bb5c2f8f19dfc15f012844399ba5bf311fabe0a66d2f279ca7e680fdec504f0. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZTAS2386769.
Las Piñas Elementary School - Central Hymn
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a44fd8ed7bb068aa176909562feb15625f95f0ad7a362c74b56030aea78b4bf. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZTAS2386770.