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 0x775a8de8844e15fc109d9e45bbb4d030f3c8fcd2b56ba9e122b839a8989dc7fa. 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/a0809887-ac0c-494a-bc87-68470da8053f.json and https://artists.proofprofile.net/proofs/artist/a0809887-ac0c-494a-bc87-68470da8053f.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 0xa70f01cf6ebadd24fc23a10641fd99793261a4b87ea3481767a9fdcbafba5438. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZRP42229592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5764f68039dd4df9fb075cb8d1d7652e97808c6f816a7baa341fa296a358b4f. 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/QZRP42229595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72a9969c60c3a41c5b1b063467771fc226cc1f4070f54544fcd5b1d65571fb3e. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZNWW2357636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b9ed5a74d0eb3d273b177d3f665b8e9093135b18a492b75061801cecbcb6609. 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/QZNWT2332677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3c9c24bdf30d4991e04566d7d1a8e9aa930f59e236959f5a764a2ba27515f02. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZRP52366262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2fd07febde8cfd1bc6c6fa67a6e9b480775cbbdb768df126f35d4f37ea52b52. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZWFS2454707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc884a688e16e5c702031e0ed29df9848f759f68c6843f0a24d03e9a1c88cd9e0. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZWFS2454709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x180a0c3cbf8ae6bbf1e0a7f9d83e0733bdd9c3a7338775010b3036cbf92c75b7. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZWFP2399037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70aa204e339dd1548e8e223c872fe9e623a67593c7bcc3dcadc6f3bee2c20ff4. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZWFS2454711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03512a48cda71f08a233e4edeab1c98b249d34301cd097f311014720d1b348d1. 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/QZTBF2489505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37cc23a9239889482f72e77e14f30a28b176c4722201c6731dc4206331916296. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZTB32320479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd39c5e9b2612a778cb8fc0efe2a2d8d6b36a3023ccbb25e0d8b58fb53fe33d6e. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZWFS2454713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc04d1968192b2042b55bc96b4e407d1572c2442bb889d385faaae44b208fc4c7. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/QZFZ72571698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e70f9d680937579be5266cb2911e86b718f31e001e952d21740905c53d27fbb. 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/QZK6M2518954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7669a217395cefd90a96a8fcb2dbc5cba004785ef0e762fdc4b40ccf5b7454f. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZNWV2560495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68b88f66da8b88f12c4203a6a8c64420068f66d63a786af9e375a5d5a4bf6ee4. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZNWV2560497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e70f9d680937579be5266cb2911e86b718f31e001e952d21740905c53d27fbb. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZK6M2518954.