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 0x63239e43f52e4a64c90d9896c8162245fb5198d04f23d6483238d9a4916ed6c0. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7cc320fd-2631-40bb-8c93-40cf2429c7eb.json and https://artists.proofprofile.net/proofs/artist/7cc320fd-2631-40bb-8c93-40cf2429c7eb.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 0x18ae2f5094e67f3cad445aebf5aa2a661370bd710b01be2a0e61284519a9f569. 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/TCAJQ2526699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b8b5ac19b83145a22d36f5aa024e736349aa5214a6cda1933247ea0d966ae33. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/TCAJQ2526709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x916c0803834668881d84a518b724ca3afc4d7c1d5b8f4a8b214437d44262a81e. 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/TCAJR2526714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12cb8bf8f4de0d6370e4306d2f3f1a38ac4f5de39b3df42b4d56d34db2e3ffe5. 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/TCAJQ2526852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe5a70763f01e3ec2e2652aae82fc4aad7a7a72db710718fd1480dbdd20747e0. 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/TCAJQ2526857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49dea5e5512c1e90190e125bd73ed22591ab0faceafe93a62397bee98bc883ac. 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/TCAJQ2526861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a558193a8bb8c455e7b9948b06d1803cf8e3cdb653132f2e4b03bbd1a7ca5fb. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/TCAJQ2526866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5707240f727bb8f010e363f858b6058da41ca3030aa46d26e9efef9bbcdae0ac. 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/TCAJQ2526869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd75ed0d787efe46a6da25fbf59f97a2488900a58ce9bad0991b3b7d598f41a5a. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/TCAJR2526874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0538196c1e76dbfed3de92d92638eb76b4650f03d0910b85508f13d05f8cb670. 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/TCAJR2526879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04dc24ad51e93ebeaf9974c46e471b1980db4381c7d498d4b93d15efd680e739. 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/TCAJQ2526881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd285d3fef4778ce40fb86bc9a5741022ebbc1540736cafb938f6ea9b9fd65c3. 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/TCAJR2526883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed7ef0910ff82c24e325da3e9fb5477df0aa2f87cf00c7d075d2c7ec061c34dd. 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/TCAJR2526888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f5db21b618213205e1329ffb33d7204c66a7476ba79312cd4faf0b96e68ae6d. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/TCAJQ2526892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f7ae5cfa76912b9e3947d5d5e5e7e99b189b86e14328ebbc14d61b6a1f831a7. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/TCAJQ2526895.