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 0x8d60f36e9d64cd0c21e4d7ce758e970873b2515d065970b077dceb71eaeff864. 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/23f4f4b8-3c8d-4182-a87c-972f86fdc9ad.json and https://artists.proofprofile.net/proofs/artist/23f4f4b8-3c8d-4182-a87c-972f86fdc9ad.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 0xf94da422cd07a49a467dc3c840ae0a536d0bb0d46102383512e6ba27366a20fd. 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/QZES62460321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a68dc968e9c340f62ba35467ca4fc65ba4993dc7cbf43a2d6ec25a5882dbd1b. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZES62460323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcdee088300385ba341da61fb3ab2170eecfda1aac264915549518396e710507. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZES62460324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4af92db293673b6fdf8382aa818d985ed9790a580329abedcf37e711622fee6. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZES62460325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe172be864f4976576b30a77deb658a9f049172b6d84e5edad9d4a8df0133c4ff. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/QZES62460326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa85159464522957dd1a6c47ca521dba4241b5e7fcd58d25372fd0e02d758b588. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/QZES62460327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7db318e36b45eccd12d51314652fed2ba4402e6b7be3ebd6302811166fadc71. 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/QZES62460329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd77f4950c16c2f2d3cb738e1bd785deffd58fbe2ad717c0363a910a8f8b143e0. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZWFS2463380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc8c8d5806986153fe73d9a4c516f0a99aa38ab3d867d3fe2064ad0c97f296c7. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZWFS2463381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x112c366c41bff97b68d6c475397cb9be35058fd1bca4a43ed7ae42e71b50b981. 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/QZZ792498922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa52a49373763cd65057f2aa04653abf17c8091f1212b90bace7696da9bff3875. 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/QZZ792498923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bce84d9b7b4706e250d990278b67266e69902e8c676d3edd904c815d1c3c325. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZWFS2463383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97d78031f41d1a13677586374888b3a2087e639de5e09c770e4a8bb2c852b2bc. 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/QZWFS2463385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6249f1925041ef04416b6e1050ae3324be4ff9f0a44f065bdcbe97784c203d52. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZWFS2463386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0df517c67d4cb8dd2a2f7d26aee5e85167772cb73024499f7d2675b6bd3ce685. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QZWFS2463387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaaed4b6ee9b0be5907218175f770ea3f30b148afb84ce2c4d2deeaa5043c7ef. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZWFS2463388.