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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27dc5fe951c5f873dfa83d89ac82e959efb6d37bd687ae6c0b105eaf89174c94. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/53f42222-11f7-4c6e-b200-df0ee8172d0a.json and https://artists.proofprofile.net/proofs/artist/53f42222-11f7-4c6e-b200-df0ee8172d0a.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0be4776e3523dc3393c2d6966a774e2077756863296f459c1bec508e7d623e91. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLG661500218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c64ae43153268797b7e5b317a9e36672f141334111b23e591c6ab9e4a05fb77. 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/NLG661500228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89a7cfa33ee4fe18be9313d56bf5e2219b2e8105ee2fc27f81ff1c528cc61c02. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZHN71977134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89a7cfa33ee4fe18be9313d56bf5e2219b2e8105ee2fc27f81ff1c528cc61c02. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZHN71977134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1babdfcf0fbd8ff439c3e4ebb22fde713d29ff8537011e2a49a4b3aa482295ce. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/NLG661600363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x314e0a3fd3960fdf3f4de35c9f65fe78e8c4145ac9563ea1bad767d8f680d5d0. 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/NLH7S2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7545f42ef6484a57b79710fcd41284e2c6eb651600240c1d20cd887673e42e56. 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/NLK2U1900339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5e456f7277d58480e3d80441b37c8a4484e5f3a5f442d234d84709093920726. 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/NLK2U1900340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9de5476727df1a2fab48fa769b5957a57a35af1db229d99d14acb20563520112. 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/NLK2U1900342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0a3cd2a21c14bbbd2e30ae9bc0dfec260cc7abad1c95336db56c8cd7fece723. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T14:48:16Z), 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/NLK2U1900336.
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 0x834f18bbd9d2f57299f576c4ffcab5e3cfcd7c55bc05ddf0c5994f4803d4b015. Chain 2 (Bitcoin): anchored in block 960155 (2026-07-29T22:13:32Z), 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/NLG661600680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c346316646d534bcad0c988db109a8aef834b8193ec49a28b704227380afe9d. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/NLG661600617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa56893839817f1ee0c4eab2f251e8bec918da5949c38daad34c72bd3a909ca45. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/NLPW81400075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaf8d9999330ca38579222802a394d1a7aa1ef3aa51c060727e5c51cd30a8a38. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NLK2U1900337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3831f9554043a0adbb3107b84715a6deafee724ca89de9bb32bdc3c225946a4. 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/NLK2U1900338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedbd5ea3131338f90d15940da4f4010db7e3fd0e989e4a0056346c82471f648f. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/NLK2U1900341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78dd3fe8c6f2c35a8a189d3f893074b6c54b7811439d46dcc6ff5268c2820fcd. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLK2U1900343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc9b70f2f6625d3deb8194d167edb6c9e9cc5f87a6d75cc7db282f0030a1cfd6. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/NLK2U1900344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d8d0759a49db3c72b7a0db09878677115d163bbbf93f7beb4d9651d457b8b25. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/NLK2U1900345.