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 0xc9b4f89116fae7ee9ca9d5450b564eb1fa206631c6b6fff59995d90106810419. 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/27d1daef-0320-496d-9c84-c3aea39feb98.json and https://artists.proofprofile.net/proofs/artist/27d1daef-0320-496d-9c84-c3aea39feb98.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 0x7d37fc741870b76273f71822f3332a1c9cb8678fd7d4642c3315bc2c8df647f8. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T13:22:35Z), 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/QZW9K2457382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76b3069fd87dda156c0fca8fdb23c802f6fd879e33d30b434f6f9afbca56d3b9. Chain 2 (Bitcoin): anchored in block 959003 (2026-07-21T11:57:43Z), 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/QM3DF2002368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34d88025c0227775235bf656fad260436988ef292fd26b0b9e09ccfc4a91db65. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USANG2199214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d311c6861716f8c6842368317c76e2c0080d3294d0dbc24ff1ec4ff2aedad9f. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/USANG2218044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x782c135df1081df84bca917456635172a64416698a1ac6292dd24166de5bdd31. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZZ8A2365389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fb7c0ac23c1bd836cb32cfc081b816673f823e82ea38925a8e0221ddc2a9bdd. 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/QZW9K2467423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x437d27964d5c84a2a51f1c5ce5d40b6ba303eee0d0e240c363942a67c2f8edc6. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/GBRKQ2575947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf07c701a80a9addbfcf721fb9e5fcb9b2d54b52864f19b563979b9308a5ef848. Chain 2 (Bitcoin): anchored in block 957776 (2026-07-13T00:05:10Z), 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/QZTRX2504209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffeff5e13bd79125a1a3b0dff730600be6a1fcc445bc64a7492adb51dcc43798. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QZ2J21505557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21c4bf1e17358c95df43eaf85ad640349f77856f94f68d7a0539ba07402d1d6f. 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/QZTV32435116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x947cb8e1f79025bfaa9c896121f449930147827993eeed3e3bc8efe15e6bcc98. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/GBWUL2166416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d5a3bd6f7439559cb3c52cb91999c15007e73d3051a792d071debf83727266. 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/QZTVM2111437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64bc4aeb45ec3bc3a0fe65311bb3c2f1882f68a331af478d21fe1ac03ba0bc95. 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/GBWUL2363033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdc728c9a7b15fd8d037b06550ce140be9e8b1c7c33d215281d1306d5628e42d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMDA62422390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aa88ff40f9aa0f43e10a908bda5ccdbde8bbd0c750a1e016d43f156aef87f43. 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/QMGR32250486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x869f59dfc4825210931f105dba1076610ae8cd735c03068c52aebdc7402fc0c6. 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/QZNWY2051058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64bc4aeb45ec3bc3a0fe65311bb3c2f1882f68a331af478d21fe1ac03ba0bc95. 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/GBWUL2363033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd081b0201a14fdd00d7ea0644dfda9770c2ab4178576647165580c7eb8d1c957. 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/USANG2108821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3907eee2652e10f34214c9a0ca4ed956f0aa34a07f5100cfa7563e3a698908a. 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/QMDA62237191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x488b7389ea4b744195d6bd215339074a762043652a2e8c166142d93c5e2e893c. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QM7282387139.