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 0x99c42227b298877f6a2895c7cf832a7593e4418ba20c2ab56ccbfae2960e21c0. 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/273c998f-85e9-4b81-962a-a3ebc7055fb1.json and https://artists.proofprofile.net/proofs/artist/273c998f-85e9-4b81-962a-a3ebc7055fb1.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 0x0c765cc96edaff5f82e67bb87c4ea789173e87ac5cd2dc518839208fdef3caa5. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/TWA239500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0a32aaeeeda0f0be5456eae667c5dafa3a27be04eb3fc8416cf60a84433218a. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/TWA239500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cd6d6fcdc5edfcf674b2ecb9cbcb854e13bf6d46bec39d4ab0633f0bded0b68. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TWA239500043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb20513b042829617b47a7784c9dae6e4156aefaed88f08ef20ea36d0d1345f1f. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/TWA219807106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf9130ef470c5023b4cd9893461fc5cded992a2bef583864bca0ead3862ea2e1. 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/TWC230155201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa222d663c120c5d063d34eb20100e1e72437356f9f1afecaabfdd165f32ec707. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/TWC230155202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x085925c12e2761825578ac009f1b593ad8a9a51bb874c5399bf6a8930ecd492c. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/TWC230155203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35ba69b19def9b624c21170cbf18d58b3e101cbb22563905d0f0a28720c4e910. 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/TWC230155204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x551fa831b1a2f282a007325d43d7bcb1b3449689eaca86d8a331502b63b0122e. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/TWC230155206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb6aaef2120926bc9e34980546a8427b2cd079f62faf2ec120001fffcd17afa. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/TWC230155207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8182b071b507f2360d0f75013987cb1e528e3c4c821ce4259baf3504d105a6d. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/TWC230155208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4151aef32e887cb0e4b08c7b78048b1183b924206e6776b6ad66e660d281824f. 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/TWC230155210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ae6930964a0139ae10389cac8f52dcb1f0617830a5716634124b45386cc1121. 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/TWCM32303002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf334f0eba658c8cd2c19d3219e519df5382d12ae0f7d25bc7a49f604dfcbaf29. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TWAN71260018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8931fd46ad6936ce5cdb33600c37faa0dbca51243be51ef0663ac5c3c3c713b6. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FRX452369311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c65a654b4a7096bf62ed5a27713b019bc4bd952231ad1f22d99285d8ab723b7. 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/TWE870505108.