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 0xcbc3439e175d5db0d6c6aa58c285fa2e4ffa183ff4b3033d069a48d19c2e71a3. 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/1a7ec64a-bb18-4145-989f-fd5159b2fe34.json and https://artists.proofprofile.net/proofs/artist/1a7ec64a-bb18-4145-989f-fd5159b2fe34.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 0xa3fc5883f75104268d6e59bae8c8a292d9bdeca9cad33d936320a4b8cc74ee00. 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/QZPLR2457676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43551150e25ff9138abafb420953ce28e88f00106b38d2b67ab8018e6b471426. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZNWZ2300469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84fd106eb903923745f50067cf86fc66121ad362de9796d19cf5e0b2da46d2b4. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZHN42015361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b18b5bca3277a34257201f137a259f8389497184dc384ba198de05cf45c8255. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZHN42015332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b0a62885e020dedb1f559f422de0cf028139ab66bdf209f33aae0562654f6c6. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZHN42028865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x153722527ae225001eecfac185fa88cb2da3bed9961d79dbcbbfbe91c33bdcbc. 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/QZHN42028866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x513bc76332f4a330b638324322c5e0f64e7c3f94ba5dfe2ac1a46d99bc280e08. 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/QZHN42028867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd616e1e06530139dbac502131d7b38667d0d8ed4e2ebe6812f444ce0c5d6fdd3. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZHN82209041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d20d659d5a4a7f3ac5b6a31bb2e44c0f199b96554fb9a76b0009f3ed5e1c07. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QZHN82209044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf4278ec10cd9c5df61b647d23440add1dc4974a2daa9cc131bde12a3db830a4. 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/QZK6L2227424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aeb769b45832e1e61c0e5083ceecebf11c659fd53a06a4d0c9b7e95d693fb03. Chain 2 (Bitcoin): anchored in block 959009 (2026-07-21T13:14:47Z), 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/QZK6L2227427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fc27bcc805a35a9b221e4900c58b195b9d7eb864cfe6d3d34bf1a13178922cb. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/QZK6L2227428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba1c50d3b3423de9c3051880dc74f4ae3de829766e2373ef447cefdbd50d963d. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZK6L2227429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17c68bac2452d8f585f8d48074148ec8316c1c4573a15ff6dec497f5748a069b. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZK6L2227431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac13758e5c16b854798983224d61ff0f754d06ce6d5fc6750f8648380f19e648. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZK6L2227432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52f0cd206239fa8faf16e3e709a1f2fd9b2b7db39b68ca4415d567ec235d8292. 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/QZDA62469886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x898b16ce56c03fdfbc6a52c38f9b5d84aa981c19b657a841c495770aa216b1f0. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZTB22420369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc99a057529b045113e13d310193dd05c0be18bc764699c67e4a6a643b27bec3a. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZTB72431908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc383b5686923a9148dd44ee9e12bbdedf4990bbb7468eb6ef09355f019d2245a. 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/QZZ762457683.