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 0xbc81e969cbb2b9c624a5c411ee456a2228ac222dc750412b001b29d670311ce1. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e8dbf3cc-a888-4822-9d13-a8cb0d3c5239.json and https://artists.proofprofile.net/proofs/artist/e8dbf3cc-a888-4822-9d13-a8cb0d3c5239.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 0xa09ab5935270a14df4dd96f95c608d7148da9540939dd408e0948c3ceeaebcef. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/BEEJ11710001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x672ca13dcbb92b4c2aeb1659c22eb79beaf5c7690f607ac94cd071cf5dddb652. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BEEJ11710002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x749a702c18dd5996d09e269f98e8466ef19823d9267f4c59ace8937994bc82c1. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BEEJ11710003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94ab84dc76cadf1f82bb69594ca213491efbc69cb6890120c0ff23fe7f7bec3a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BEEJ11710004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b8ef9663792ee512d717b42766b5a7170687a83f4771b5ba77131f8ccebe7d1. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BEEJ11710005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66aaefea9c2650d5c9dc990471637c79cf5383dfde420be218ac0d796fddad2b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BEEJ11710006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b599c80860979c2927386c53115ae14361662484306489e2b908bece181a2da. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BEEJ11710007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x920a844f5e84b3086b68b054a01deace6ac95b807181c495f9ffce518ee722dd. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/BEEJ11710008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7bbcd8aaf3174c21ddbd690f383352319a0b0ca932fd26266944854308f2876. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BEEJ11710009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x597fd03d55b47a2a2c4fbf74d8837bc1e646fb1d58a7254ab08e078825d4e476. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BEEJ11710010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf94672b5efaf53e0c479ce8631687fd2ad620d9242f81a3a4b716818411a9837. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/BEEJ11710011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f56f35cedf085e3c4c76ded0b07dada79941b271dc0762de6f5a8780a7e4810. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/BEEJ11710013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a9baaf36667429de8a6ff53d890854e0060522d60f12e66bade8cca7628eb86. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCACZ1764386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8981cb0f7177e58432e1ce618b58e002e4fd7bb871b13bd853dfd3d91c718f2. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/QZNWS2194864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cd676c5b443c1749773fa65728c6a0abfd9f722e452988c81cfdd24111d6dfe. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZHNA1917349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x959dd56c1abb51e952bd1420a1025623593a1ef8d77216872a2dcf25c08d76b0. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/QZHNA1917353.