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 0x07fed7dce42bbbf3fe178f5952b0702ebde5ac42e75443e4706883f03d2b087b. 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/cd60864e-6f7d-4853-a98d-a9e59aa17871.json and https://artists.proofprofile.net/proofs/artist/cd60864e-6f7d-4853-a98d-a9e59aa17871.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 0xee642cd0d5d41b8bf98f40a7e7e073bd51971b07a19bebac1558839ff42d0e96. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/SE62M2317744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7fc40538b2b5ec789907d783a30ddad1ea0cb58ec6c2f242860621d4affc14e. 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/QZZ972420730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b34016bb6fd9bbbd9050189d443c034e9e61bec1a7d1b5fed7a421abfb994a2. Chain 2 (Bitcoin): anchored in block 957544 (2026-07-11T09:08:48Z), 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/ESA012402824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b91f1678de4746ad1f81af75c60b1cf085f18f559d7d66df91ed545acbf3b38. Chain 2 (Bitcoin): anchored in block 957544 (2026-07-11T09:08:48Z), 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/ESA012539936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x751ec3d51042632ecbf12c636a806971b642ed74f01539cc1050b3f2ad2ef0cd. 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/ESA012539937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb164ead2d3519a260201990acb4fb2a0b095a0dc9fd77c1c6b21518c059a9f1. Chain 2 (Bitcoin): anchored in block 957544 (2026-07-11T09:08:48Z), 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/ESA012539938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x819ed466ab436d03daa3299bc64e8a9fea64502071708f3a4496117adc73d682. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/ESA012539939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7fc40538b2b5ec789907d783a30ddad1ea0cb58ec6c2f242860621d4affc14e. 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/QZZ972420730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b34016bb6fd9bbbd9050189d443c034e9e61bec1a7d1b5fed7a421abfb994a2. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/ESA012402824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ff4432af325c2ed278c5e2d1b03f1b26975b424dff0475f6d01cd4cd4e1ecd2. 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/ESA012589095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe041ca32b20659c84e4a4f6a5701d3315ca225dbffb6e5950bddb5db41fd3f8f. Chain 2 (Bitcoin): anchored in block 959146 (2026-07-22T15:41:47Z), 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/ESA122500947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a8000263f5aa68416bb55232ae9d2f96ee6e8c6b525a690e3add64fb1f7efd0. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/ESA122500948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3680377b4dc896ef02f967affca5dd8a60555714ac854877e97a6d44317412f0. 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/ESA122500949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53fb727783b6e3c693e21970c9306e1480b7f9e6b7bf5bacc3723dcf094491c9. 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/ESA122500950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ff4432af325c2ed278c5e2d1b03f1b26975b424dff0475f6d01cd4cd4e1ecd2. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/ESA012589095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd98a402bc0a465c9be4e5827b4e7897b17f7d27b5587985213fae4cc9eebcbd. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/ESA122500951.