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 0xb122caaf22cf96e49bf42787193141e5e9ee31a312a93e0a403e6f338fb785f0. 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/285c02bd-ac7e-4c47-bfd3-e53a9ede759e.json and https://artists.proofprofile.net/proofs/artist/285c02bd-ac7e-4c47-bfd3-e53a9ede759e.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 0x5b8d8c28f90dcd2948bee27fd636dd2aa5e87f7fd8dae368d0ce4be5dcfc21d5. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/TCAHK2389745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa50e4a8fd469701edd5d6532082ebdbd84a3806fc0bfc98108bfeb233ff8cb6e. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/TCAHL2324809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f6ce6b91537c2cb18d40c68ebc2a217770af155aac06dd8ebf0b93a7217f527. Chain 2 (Bitcoin): anchored in block 958086 (2026-07-15T02:55:47Z), 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/TCAHL2359529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cdbcbf7f3e9c0be99b81f1e92af4d23b97b560aae5ecbac474600612348b17a. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/TCAHL2359537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x108d3cd69482dd5ad2df3e711bc4f13cb03b7f9b1cf3e02ffd8dad0f6fc97518. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/TCAHL2359540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c4df4765ea7f10c024eeabc4ed5084b2f131a531d681e99d8f819f86c54714. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAHL2359550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1664cd8a4c5fb05933af94cdfe870f6fd7a71af3e028f95b0c3f610095a1878. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAHL2386013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67f91a374ad46992ba1dae66ba5ae113740f9f2273e479a126c9685e6d6ab7c9. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAHM2310918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf2dfed49f04fefa75bf7dc85f1f552f62330a0b50b95a44bc2a14c1e2b33ef4. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/TCAHM2338471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49171cb02de000e2b230c9130368ed52c25bbcc20652d2ed7402ddcabf4938bc. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/TCAHM2371378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea6f79e5a5bb51e344018288e7a8ee4304edaf2ca07c1d9d74746087935cc8cd. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/TCAHN2344947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8166314d830b97b518bf1f7ca345383fe7dbaca5bf1c111cf8de26a324576acd. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/TCAHN2368965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92cfa635cde4085c80cf3bcc7d906212a48c7877beae57edbdbd8c5ed7307b6. 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/TCAHO2328389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1987cb4db31ef3c117e2e6c535e221c6cabb1f4c4b918822b285c53627c78625. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAHQ2300501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x088ce0684538f0944789c5c7ea516df737c66d83c2e18da03f4d192a499dc5f6. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/TCAHT2333163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf6098ea80552f95da643e19ca60e6ff2cc53c0d57bceacae27c6d87ee57450e. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/TCAHT2458792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5d730e07832cbb0894043b466d0f8558956c5c93eb88fb309d69d1dae067d26. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAHU2432247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e5a775fc23ea29f7fb98bb26984183a0cfae5307a80c71d04e5677579af543. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAHU2493993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a12e1e4f3b2f3b1853be07c7fdd3729c4f89337c9c15c2e7ac5837c5458126. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAHW2403853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ae40840d52cbe975a4c208561f1077aec31633f442025e1281c2507eea74f95. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAHW2463350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38f8921f2dd225ad3570498f81f9d755611fca9ebd811e4023bb53732f5c292c. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/TCAHX2410650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5860cfd0a6cbff362f6ff218ef5d04551d82a4607e4dc1cb67012dd54e5149d. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/TCAHX2410662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54de79d847c611d44a667b32b030fd14011b27931edc8bbb72384968c27cd5b8. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/TCAHX2410679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51e0df4e7fa889b988e2b871b9ebb7a03df74b0bf19a63f1481a3a5fd7f1dad4. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAHX2410684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd86c5f739f681278fd0db0c89729ccd0de89538d0f9f828a7a1d626d0e97241. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/TCAHX2487329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f58efd219de056ed088127ed471a66ca6f9f6c304d7d957616e04c7bc293431. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAIA2411184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a9ed17ce645ea5e229a6bba1f59755a1c8c6432636b3334e8890d268f46c02e. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/TCAIC2477708.