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 0x886de855f0378a2fbd683b3f44a2db27d86eb43eaa64ca290f5f94157018dd5d. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5ac8b676-290d-4b0c-94f3-0f6d12b7ab62.json and https://artists.proofprofile.net/proofs/artist/5ac8b676-290d-4b0c-94f3-0f6d12b7ab62.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 0xbfa13bb1a0d8b5193d4266ddfed691ac403630a4c6750fcd6e4e8bc05f00eec5. 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/TCJPJ1935038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9fd54ccd5f91b87831b6adbd9a792294ea3c1bfdaecdb4959b13887c4932c8c. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/TCJPR2253470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e71d4fab88af4d2279506afeebdc38c16f2b5bcde578a8d7bcb9347c880247. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/TCJPG1727072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15bcea43fba90eaf31694b662dce9577479f080ce17021168e23201ec9ca7ec5. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/JPS801853586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff3dff1879d59608703dd61d03eb74b4bb60b0a3b45f98a21ac58121bbec331. 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/TCJPK2081243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe025af5f54daea9d66b5bda4f1fc9cbba89f95de920db57db882c5fc2429856a. 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/TCJPK2085422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd299c5edf9673fd5eb27a3a4a3787e8b76c21fd05246cc55f57770f912c4637. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/TCJPM2001301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x418557bf2e26eb1603fd4902aac2456a0bb1d8a65ec8aeecff2d82e1ba6b3071. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/TCJPM2001306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a1b578268be137e6aadf94fbcd85d37bdffa74e220bd140dbd948fee41e7918. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/TCJPM2001313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ed673f91ce97d09a3cb518c7eb765c407327eaa480186b8e86a389d35e4e9f7. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/TCJPM2044206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0687a636b992f52a3df2129f9662d74239950218815c1251ad7f59103c5fb5b7. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/TCJPF2583804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48dcca148f96230520d223043d1cbe756703b3e62fbee01753719b23d1ffe98c. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/TCJPF2583807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fd593e2fa4f9ee451efc442384dd11abbd52277648a7e72f10327c08fd98e97. 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/TCJPF2583810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b88d4a5c4c94c30fff089366143284381a52c4b334a5a8cb34cbf7aefd3d756. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/TCJPF2583835.