thumb|Tokyo Skytree, the third tallest tower in the world thumb|Roman tower (reconstruction) at Limes – Taunus / Germany A tower is a tall structure, taller than it is wide, often by a significant fa
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 0x35e06a33781e1ea785e135eceaa6cce266931db9b3742c008f2b50e7cdf6de0c. 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/62cdced7-9cc9-45f5-a015-d74fbccc1f68.json and https://artists.proofprofile.net/proofs/artist/62cdced7-9cc9-45f5-a015-d74fbccc1f68.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 0xf0866319b8148f37d445d739dcb4ee84fb05c0f13afc2db69417a8fad068897e. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/ITI292101902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec51ddd0a3a716d5a16c8c490ac4749eb6b41eccfb46f6ff40348d83fd677f42. 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/ITI292101903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1614620957e37c5fd89a249bb3bfe0ef618f1d74f77c2cc4cf74fd35f7d7a1e. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/ITI292101904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2973d3097fee91f75a10df6c4989e42077ce54bfd8d02277e76c75b43327a9fd. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/ITI292101905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x386729b9d3a7a03d5d27225bbde743d2ca1e49cb36011814f551df8e15088652. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/ITI292101906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b2842e8a165e76696ccf9b9826afb4dc4b016ca2921ad81b61eb15eded84a25. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/ITI292101907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3c04a358bca86fe932c80a81dd641dafff43e98070a513379b9cfd134ea4869. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/ITI292101908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x440fbab2cbbf58a0a563b9bcf189d8a7cc93b2e365af09a17b2102c43c6e5fc8. 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/ITI292101909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a9e86b327a08fa9075f7a336a3f653ea6051b8049b8243af6ded5aefc5454c5. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/ITI292101910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a60c2f106eb7ec80a2008945c4b5c68c06bbd392098a9c8307e1891b77a9374. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/ITI292500201.