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 0x0abff509a814a89fca284d17e3ec0a85b4d5f93442c54d1b525ac0aab45c35a1. Chain 2 (Bitcoin): anchored in block 953706 (2026-06-14T23:14:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7bec3af6-c6f7-4508-960d-dfd90ba65c8e.json and https://artists.proofprofile.net/proofs/artist/7bec3af6-c6f7-4508-960d-dfd90ba65c8e.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 0xfb8d88d01a26df68dc084a58695b3264e793e60e5c3a8e0e04a40ec643f3768e. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/HUBE72300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a7648e2c16b30aeb1e939fea54e8b11babaf5f76e2f46f15520d1e220f230ad. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/HUBE72300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9399b67dd07e9777d772686a47474aa9cc3cb63edd3e8c13231b427035e9760c. 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/HUBE72300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4d9bc5a524c2f6a4efd264427aab893e87fc7569cecd896939bf61d656b7914. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/HUBE72300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd18be71670a0bf0fd7d1bead37261ade572a353a9b9975c1ac4f8becfef5dc6c. 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/HUBE72300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe65b591bb123815a0d194f6fb952a0c39a74c26531517115f20bd43c876c84d3. 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/HUBE72300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39300c3af996b60cd5d8f95e14d052749cfc89cb1b877bf4ed1c529a33c82141. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/HUA612302279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa17869bc923f140584fcd15ecbad41f001764c944f8e2ceae92c9b4d87353178. 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/HUBE72300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d6447746bdb47dbf3f6ea55301d7b2bf846ad3678c868b8c1f88376ed3ee7c1. 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/HUBE72100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08bc4cf1223735e270e70e47e316d724cd66cfa45c5f49152d21805e1e656ab7. 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/HUBE72100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x683a7161064d1dd32693d0f7a61fc54152b166d1e72499ef0dea4e11443d1b16. 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/HUBE72100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80309a187486fad20e9e51e80287f2fd5a111cbf980fa816eb1e15b2c6d8eb3c. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/HUBE72100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d8bbd0d748997e4391494b6a67f71b12ca1b4cb69db3f959307dc0c27740622. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/HUBE72100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc20d5c93f4a6e3594a3f08b1203078662b1936bebd137a25c903f89bb07aa1dd. 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/HUBE72100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49da67456b9b1b9837d07db64de86246ad6f9905a089840ec16af38be37c33c2. 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/HUBE72100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14bdd738014875965a33444b73c8bff01813c88efd63cfacc905d56351f8069d. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/HUA612301022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ecbbf2a68a77d8fae795d4816093f402686530dcfedcb9fb495b25a7517fb4c. 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/HUA612300779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2dd7d481e6f892defb8b5fde5e0aa14074144bf0e6b0ad8443b0ffc6e01fbd1. 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/HUA612102339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18b4481afc49811b8913376342850ad3d179eaeada9d08b79c5dfecc2f9d5298. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/HUA611903164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f18c1aec549adc0bcd7cdeb6d81808f5fe00dec996671f6005188c37cbc728. 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/HUA612501687.