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 0xd3bf5898bf63e3347a1c47cd7fd3168e78db6b690dc5be42120a38a55eb85f63. 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/3bbefc6f-4f44-41a3-824b-574b58fffc0e.json and https://artists.proofprofile.net/proofs/artist/3bbefc6f-4f44-41a3-824b-574b58fffc0e.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 0xf5c10dc643fbebf41a5276e3d077996a91d024a24af640dd8c734adb4f5637aa. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/QZEPW1904702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x539fc70803cec04cc0b7ac869ed9f145a93c286bc92671e40ad5e52d41a5dc71. 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/QZEPW1904703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d189aeb8e6efec58cf4ff3b16e9a5ecad0d8476d182c6caa030c9ccffeb4239. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZEPW1904704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7b793b4719d451a59de2795fadc76b3f3da355c43da43ed91d872b1e54cc239. 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/QZEPW1904705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f247fcabd65396b2de51d3adbea7112f8c17c00e3ddecc351e32be6e81d17bb. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZEPW1904707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e9165cd9c19f40b4dd9f47526f136bda3a4434b77c31026f82596756a21caaf. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QM24S2302594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1e2af49c95b43cf8af903c1fa8ec366ea8f32ab38ee71af947235c97b412006. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZEPW1906701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6adf01f3fe5753c62698acd3b67f6c4ea145fdfeffab86c377ee862a2ad6e099. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZEPW1906703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfaf927b2c8e7b1f28d3d33ed9a5538db1a32af6280ac8d1d7cae800a51fe22c. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QZEPW1906704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37fe2087095369818513be3045d9b524f32dc731de59a6ffafe4f3c8b395a2c6. 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/QZEPW1906705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x393a439ef2eee9980f0ea3cf68b4fb756bd5ae6c7859717a183d79e25567da4f. Chain 2 (Bitcoin): anchored in block 957874 (2026-07-13T15:43:57Z), 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/QZEPW1906707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d89f59fcb8419590aaf0b9e9e6a10b49ae0ad709cdeae5562bed999d19c0672. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZEPW1906708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3201aa86044c9ea605f0a6b42a381df8d7d63275fb99e8980c16ccf5203c1d67. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/QZEPW1906709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3923a1d30775a35c76f065b3b6af94f938e244e4efe521343a479f7e34e4320f. 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/QZEPW1906710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfaf927b2c8e7b1f28d3d33ed9a5538db1a32af6280ac8d1d7cae800a51fe22c. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZEPW1906704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37fe2087095369818513be3045d9b524f32dc731de59a6ffafe4f3c8b395a2c6. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/QZEPW1906705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8bc11d990c101824f840d6749eeb6f4b9b811d836f42c9aaa5678a3ee8c86d1. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZEPW1906706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x393a439ef2eee9980f0ea3cf68b4fb756bd5ae6c7859717a183d79e25567da4f. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZEPW1906707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d89f59fcb8419590aaf0b9e9e6a10b49ae0ad709cdeae5562bed999d19c0672. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), 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/QZEPW1906708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3201aa86044c9ea605f0a6b42a381df8d7d63275fb99e8980c16ccf5203c1d67. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/QZEPW1906709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3923a1d30775a35c76f065b3b6af94f938e244e4efe521343a479f7e34e4320f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZEPW1906710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc25c0535fe09a073e90ff6b8226e687000972ca332f1a1ae404aacade77c67e7. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/QZEPW1906714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eed67b5928ebb1abec72f3a45b752001d3c1a1fdeae60c3dcaf699ede4b884e. Chain 2 (Bitcoin): anchored in block 957778 (2026-07-13T00:08:48Z), 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/QZEPW1906715.