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 0x3edf2ea35a7b336f9b687d80ca515325056440374af696693cb52543a0ef1954. 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/4678cf4f-1e31-4dd1-8bc0-8df3501d6e91.json and https://artists.proofprofile.net/proofs/artist/4678cf4f-1e31-4dd1-8bc0-8df3501d6e91.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 0xef507ce524e42ee8e8d9df52ee6cb2bf0efc35b05af5383240ae12c8a3cfbe14. 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/QM4DW1760054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd24570421379380c5958e17984dbcd2b6eaf5ce47bdfa69e790f4749bee91314. 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/QM4DW1760056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x148a4fdeaaa10f90d97d0b2f7411885d8333d7484b2a38b3444d76ad942c8ccf. 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/QM4DW1760057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2c310551a55d8a926b552ee86eab23f4a4c35a7526e4b62e42d21a7269c1f26. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/QM4DW1760059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01141ff4510a70242c2834e1fd36808d545823971cfa287669b3a041463b87de. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QM4DW1760060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa66f8ecd8ff140888e60a9e376617e8383dcc528677b70bd953c20d70d6945. 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/QM4DW1760061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea937c5e6ba39ead8ab59a730aaa15633d6962d2608b1d0ac0a2a39a329d068f. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QM4DW1760062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e3a4184b7d08c0737ce628271c95feb1ed2a0b74592b93bd8ddfa05e4baa53. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/QM4DW1760070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda1dbf99beef180b6c8713e2a9d019a7576d02e05489d328fbc3c11e02b64d88. 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/QZES92122848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05b109825e15eb35228a0de0165c06e1deb78731c6a348c21b00951514de76f8. Chain 2 (Bitcoin): anchored in block 958776 (2026-07-19T20:11:59Z), 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/QZES92122849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98a763ed6cf65baa13b0eca2d7a9eb7db5278ef41a8157d92d738e8ee2e8ff81. 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/QZES92122870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73a36fd46646539ec012c79f00d73a5564f22d52a7c69f765a64f6cd6807bd05. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZES92122941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d4ef889792004eef3b87bc70de57427ee2e4594aee2ce822a930828a2dd65c9. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZES92122944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ca84c3dcbc183ceb40348dc21bd1fbbe7b935af63e83a9b85f5ae3b6d6222dd. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZNWW2298812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9d5ff008b82cca4e95205b55a162456594c827992f519c2b6fd931f2739ad82. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/FRX452405907.