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 0xb5140b7abf3cf555b83e0323c9713c538f04f5f8fe1786be062523e5d1d0b479. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dd42ac15-f2e8-46d0-b62b-52e7044a53b7.json and https://artists.proofprofile.net/proofs/artist/dd42ac15-f2e8-46d0-b62b-52e7044a53b7.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 0x19d7cdb9ee6c78e7d9ba4aaa8196e7edde1d43958189eb50fde78c72d9a490d4. 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/QM6P42060065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf1669576108b4f77e81a559bffe19ed697864eba8158d8c38a26d1e2af48922. 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/FI7S52000113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd84f59c1d4065453b360610789ae78e93430628cf4ab1d91e6bce443fae6e7f. 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/FI7S52000114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5d2fc6de7aebef689a8f194b3707475f354ed37a074fa3dc1f8c2324bc5a594. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/FI7S52000115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65e695a8927fad6c85b0d6e10e1513835611a20a43ec7053b1f654ad22402e9a. 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/FI7S52000116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x037e99b3178d2b11bee5e64e6b7c2aae49cda255539c6add57d46c76fa611760. 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/FI7S52000118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4609ef293e012bae11b83d83f6adeee61d7f1b1afd23e417b8ce01d72d9ea5c. 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/FI7S52000117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19c2151b18e86a7d405bba52969cbd38503525de5dafc26ce3a8bd5179e5c792. 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/FI7S52000119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80125bdc692227f36cbb6c5a4c5c4b30b8c79c13c6437ec2575aeb7cda984598. 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/USCGJ1972442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5d2fc6de7aebef689a8f194b3707475f354ed37a074fa3dc1f8c2324bc5a594. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/FI7S52000115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf1669576108b4f77e81a559bffe19ed697864eba8158d8c38a26d1e2af48922. 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/FI7S52000113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19d7cdb9ee6c78e7d9ba4aaa8196e7edde1d43958189eb50fde78c72d9a490d4. 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/QM6P42060065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4609ef293e012bae11b83d83f6adeee61d7f1b1afd23e417b8ce01d72d9ea5c. 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/FI7S52000117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80125bdc692227f36cbb6c5a4c5c4b30b8c79c13c6437ec2575aeb7cda984598. 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/USCGJ1972442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0a6eedade8a8e42cdd269082018a0f2fc58f0b5c1d7e808a896491bf7b98e6a. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/FI9PF1700117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26721882cd8ee88cc67d3bccd9f541d09baf9289392a24ce9e11bfbd36a839ef. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/FI9PF1700118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f918c9d51115b34bca93e6399691b7bc6ea66ca937fd3f9c7565ca1119961b. 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/FI9PF1700119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa159c4ae986c8d3bd5643d88e99667787eb1495492a1db551080ab467bcdfe18. 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/FI9PF1700120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c7a4ba50d06298d2e535ab9c132a41739fec210fd182ecab165fcd7240947c. 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/USDY41782908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9171e27ad45405e0573e6152ea531274fb37f2cd4f63b5e1dd039b1ff183d1d4. 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/USHM21763663.