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 0x7e1e28e3599b03f0985e84156ffbf31a1e6745e845e1dcf6b6c1f906c0bc6ce8. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f46546f6-e4d0-4d44-a713-d7bafe8c63ed.json and https://artists.proofprofile.net/proofs/artist/f46546f6-e4d0-4d44-a713-d7bafe8c63ed.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 0x78f3222f46b70c5e6ce1c3d9f95baa8fe2bebfae21b02d1c74adbde6bd5b6ee0. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZW9K2350834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84272c7cf4c09bd7897cd1a91a4e0befe7c8fb44b9d618b00c252f623a960e9e. 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/QZW9M2339320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae4e04c6323a139290a5a8f94ccbf1e936ec465f24eece5d1823c35ed189a1e1. 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/QZ5AB2400040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb1124f6dbafb0e1ab418600ba5df93f1ad88015ab82405fb50ffe9953bb80f1. 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/QZ5AB2427828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36f91658b0fdd1771220d92025d3564da0942f293a5c2fbac2fe15cc46ffe946. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZGLM2474826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfbf2610f393449e4b06038bef894539221c86541c69555443455e6285c4bf5a. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZNJX2437639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb20814163e81d5ec7e4caa01dc5cfa5f866b1b25ab0dc2f2467dd04d01282314. 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/QZNJY2425000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbcdeaca957dacd1e6954b678225b86e232f6581b299c377043ede3848a62769. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZTVM2423693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3bbe63ccbadd488b9413c510494e6a5b1db582b0e4bdff1f131f9daaf1fae9a. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZTVM2425813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe05cd5351b2b7b9074aebdf88b497b8e1410ace92eedbfc0d828f83bab6822b1. 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/QZW9K2433004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2128d2fd6bedeb1a066664481fab1cc65f8d4d67002991a89b93a4593b9495bb. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZGLS2561645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6be058da047d51455474a8cf5dc603d166540a515c73309fe8ba01fb80bf16f0. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNJW2577821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63a59ac4ec2e698d13edcb0e70ad3327c0cb957918acfb187f5dbcce0625679e. 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/QZNJX2577863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47e6848bc84e672e3ca941e8b614c38c9ea25143b31dcf426f0af7fc634bd8b1. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZTPX2505655.