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 0x1552e1894d8eda690329cb9e8c989ae8a5dd90ad8327ef344be6b9ef94217d53. 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/8d62fc52-793b-42c8-a51a-e855aee45cf0.json and https://artists.proofprofile.net/proofs/artist/8d62fc52-793b-42c8-a51a-e855aee45cf0.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 0x0ae9d313358884da4217af4b595a2dece6122ddd878b00c6880d4f83cc678b33. 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/US83Z1781463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf83d3f80d9794a00c381f1de19bc13fb7dc1481804beb763381e7a67ab5f66da. 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/QZ5FN1989708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd647b890c089ce1f05c88aff81f24eaa89ea36f360227ed56b4d62ae29de5ecf. 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/QZ5FN1989710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8419ce57d00d8d140f9c7ba59b64d7454de89c04fc818d821a324f3ec2b1df12. 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/US83Z2025557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4356eaf8fa893acf4d1560d1ae36dfaf8a829b5ca8a30130e12efa96980a486. 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/US83Z2025558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x467e4eab08057d2aec7b78398823406df03552a5e09e3ac24be691b10ee7c814. 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/US83Z2025559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95cfad5bded1b692d8043af5fafb77dc863150dd8c587531755490f989060fd9. 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/US83Z2025560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5e87ea7a7188862281bd4ec6f3101a564f2bbb14cd8a6dc38514a7b22b80e48. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/TCJPP2179298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94199ea2cafaef003b8a2aa09606cbf13c9064cc97cf385608a74c73899e2535. 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/TCJPP2179299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50bd190ba25a51100904bae9f7690aa7a0693e8aeeef051dd457a8114a85a88e. 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/TCJPR2246519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x921a7e69715113cfb3e4f4e5141faddf80f32a3a8c4900e7e2008c524d306412. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZTBA2459226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39402e21d9aaebe873c378680408f2f4e137bfeccadb3c588b8d6e81ba84680. 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/QZTBA2459231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53ff491479e5cab75c7602fe552c87f1280d6a38526f0fd4f651a03594d4146e. 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/QZFYY2553016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e3223852858d2b0d397e3e7efcc002fdec80bb8369fdd867488a738261ba18d. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T19:48:47Z), 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/SE5Q52500154.