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 0x58b6daa3275e38ee935105a9fb1915a9afe2b999e5f499fc40b440b6a40b1246. 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/0c83905c-9ca2-4719-9c64-e28df196250a.json and https://artists.proofprofile.net/proofs/artist/0c83905c-9ca2-4719-9c64-e28df196250a.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 0xa203a5908b6e13bdfda079a83c4fa3e31f6a9e3c8e78cf0b7359465810cdfa71. 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/BX4IU2504370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe921cdaddbc5893532f43caea39fced999e6e0506da83c0ca41b02039d38cd6. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/BX4IU2504369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcc2dd845b7b83c6442f493bf212a73317ef6701c7478f1de4ff9515d06b52b2. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/BX4IU2504368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe19bf83abc4ccb28bfc55b81f4837a2d6df484692b40382bbaac2ae2dd9e1a3. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/BX4IU2504367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x099a4c27acd16f41ace657e4ecacfae114ab0673c03c8d9878f9d7329c3d54e9. 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/BX4IU2504305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77201dd966a645fc24250ebe2ae1a236d01d705d723c54e6ba428aa69e17fb3c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BXTQF2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaef2677447b3926a62620f6827d017d75247534c91586082d6655ef5201b433. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BXTQF2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed23f2acaecbe1dc064567b9a45309ebd4f3c64e34ec3a89dc0a59e238806f66. 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/BCN412100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb74d82ab8b1a195b81f89a061a299d8ab5c3f1d5542a46321755c3960551d7b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BXTQF2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0962ce094bf2f42b0dec181e5fd48c19c62eea0f8a5457ab5e5d576b74546a31. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BCN412300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f8454fec30b3567ce84f3f93269da87272582d345225f2fa8d815c29ccebcc5. 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/BXTQF2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x428827db206bdafd6e95aae4662ac9b3353473f1b987e3956bb2fca074f2516d. 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/BXTQF2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaad5ce0c0f9e20d25fb6e8faf985abafadb4da3c3204cb8cbbd1f27649810a24. 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/BXTQF2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ebab11e9e181b086b5225fae07ca62389b72d4c7d85f2285d9ec4bfa5a56058. 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/BXTQF2300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77201dd966a645fc24250ebe2ae1a236d01d705d723c54e6ba428aa69e17fb3c. 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/BXTQF2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaef2677447b3926a62620f6827d017d75247534c91586082d6655ef5201b433. 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/BXTQF2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed23f2acaecbe1dc064567b9a45309ebd4f3c64e34ec3a89dc0a59e238806f66. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/BCN412100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb74d82ab8b1a195b81f89a061a299d8ab5c3f1d5542a46321755c3960551d7b. 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/BXTQF2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0962ce094bf2f42b0dec181e5fd48c19c62eea0f8a5457ab5e5d576b74546a31. 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/BCN412300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f8454fec30b3567ce84f3f93269da87272582d345225f2fa8d815c29ccebcc5. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/BXTQF2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x428827db206bdafd6e95aae4662ac9b3353473f1b987e3956bb2fca074f2516d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/BXTQF2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaad5ce0c0f9e20d25fb6e8faf985abafadb4da3c3204cb8cbbd1f27649810a24. 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/BXTQF2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ebab11e9e181b086b5225fae07ca62389b72d4c7d85f2285d9ec4bfa5a56058. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/BXTQF2300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72a23b816ffec14837f5fc6d1521c1a820b8ee46fc843ad5022526ec2df045d6. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BXTQF2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10c736f8cb2f75237fbdd2700e923b64bdab316a97e591a0310d3e6f54a106f. 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/BXTQF2400005.