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 0x082531a633bcb2855605e8d569900a0a5eb4728efe3d683a680a5b5f41d1da12. 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/9fc6bebd-093c-44dd-80d3-d52f4ad23801.json and https://artists.proofprofile.net/proofs/artist/9fc6bebd-093c-44dd-80d3-d52f4ad23801.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 0xea85f31e7bf0420ab24dc306d8f6d872d28a0df3ddf51043633ef2708b7b7974. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QM6P42301538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa53cf5a22858ed36230913344894ff7a62c464ba337e58ce80bbd400132c00d3. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QM6P42301588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e1a270b44f3ca926164735d5696bd13c37bcba1d026c8290c1fb786842a5cd. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QM6P42300935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97d53e1805cfea8bdc2730c94d3a07a56094f8561b50a0408dde027584e1041b. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZMHK2342152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea85f31e7bf0420ab24dc306d8f6d872d28a0df3ddf51043633ef2708b7b7974. 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/QM6P42301538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd9543ba21a86efdf562084a7af21c6dad084a58e746207d66a6f2d922f48c4a. 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/QM6N22438837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd9543ba21a86efdf562084a7af21c6dad084a58e746207d66a6f2d922f48c4a. 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/QM6N22438837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6022c4dc7ad7d0efe6f5bd14d166df9696342d68e4c46b0711840f11b83822a. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QM6N22445681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafdaad4433c99d80be7c5d346e2d262dc90943deaae5c16828399a8c8ad50916. 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/QM6MZ2449496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb4f4b3a891cb08545258701f1e6de8ac9ecdab3e4a454c4e90dec79e924db9a. 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/QM6N22445679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6022c4dc7ad7d0efe6f5bd14d166df9696342d68e4c46b0711840f11b83822a. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/QM6N22445681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ebcc76cde75ed5ff998d496d7ac6312e5734d2c1228e6cd44775de224e67f90. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/CA5KR2528062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0fd669a1914569c03464729760c77f27516ab7b2b3e6477aa4d9e16c6c696ce. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/CA5KR2528065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc9ef0efa7aecc8ade924b3aeaad208f04e05cb9565fbb8b57d61c7d35995d71. 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/CA5KR2590528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b67d87e4d017dfdabbc672faf0b41239a77f23dd63dd12cd46510b41f44f450. 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/GBAHS2200900.