Pitusa () was one of the largest chains of department stores operating in Puerto Rico and a competitor of another chain on the island, Topeka. History Origins In 1976, Israel Kopel opened the firs
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 0x0bc887eedbc497de492fc57df16aa0e750c649471c7061cda645790cc16e52d3. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c25f54fb-f0f4-4c86-a362-7c59ef7a4e70.json and https://artists.proofprofile.net/proofs/artist/c25f54fb-f0f4-4c86-a362-7c59ef7a4e70.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 0x9436f45d32976e601f9cab4f682f0de9c23492528bbcf5bb062fa98146ed68ae. Chain 2 (Bitcoin): anchored in block 958086 (2026-07-15T02:55:47Z), 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/QZNWW2196658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a7c0901586df1271f0f97b74a2bdf28d8531e3af4c745e289cfcd82496766cb. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZNWW2196660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7e65c9314c739a26a2138166e77724c2b39325a8f4c6570bcd2b6244d99fc5. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T04:10:01Z), 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/QZNWW2172906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eabded9a7e86b789045359e518a06541ffd9222115ff5d891ad35e9e6071b87. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T14:33:33Z), 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/QZNWX2103285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x107715e44a95d076a9b91c0dd8af01cd488343eae28b6f833f4319c2c91731a8. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZNWX2103290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4f6a0184a7c62ac6934999626405ce98310b8285a312996d125f3296528599d. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QZNWW2172759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59d52d2036fbdba81a272a5e00ed6321f6f0f62b393d422422fb8e09c2e7e05b. Chain 2 (Bitcoin): anchored in block 958827 (2026-07-20T07:46:42Z), 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/QZNWW2172762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x011f8ef6e0003acb64411891b49f8445a7eafb0abf9211ea107ef7c57927588f. Chain 2 (Bitcoin): anchored in block 958776 (2026-07-19T20:11:59Z), 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/QZNWW2172763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52170952070f42e6e3e4fb76221d1c6a854973c67936e1a339359397e51310f5. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-22T01:29:37Z), 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/QZNWW2172764.