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 0xa8cf4a29653f235923488653692d586743fcc4555115df56cdd29321d1d2e1d2. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/039258cd-ef6d-4b12-a2f3-bfdbfac18d51.json and https://artists.proofprofile.net/proofs/artist/039258cd-ef6d-4b12-a2f3-bfdbfac18d51.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 0x945f6dd83a9f41f0f1e34d23cf0d93693828a4349a20ccfd6ae22d2524951db3. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/TR7802200350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x148a1543abdbe9e35ff6ecc510decbb7adf4351909621c167b715ea485b3c5ab. 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/TR7801800183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d146d79905236fb9c7119cad60c3b24b7fd036b14934dbfd2088c1bc08eda8f. 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/TR7801800184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5905223f259f2583fe2999b94dd855ee5d5d967db7f40f74f9ef97c44b176837. 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/TR7801800186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29134ae7c179f30bb0806b275ed03d9ce82422402083105a2b11999d1e17ea44. 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/TR7801800187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd16b82025496b9cc053a6b17590e60ae66bdcdc77b34887180a3be0c8e64f6fa. 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/TR7801800189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9056ac5c94de75b5ef177410ef65bb453c5a6bade7f2717e02b35bf64cdb396. 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/TR7801700094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc70f0fd4faa14eead6b13147f561fa88144fe48509789fa192b1a360e36ddc56. 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/TR7801700095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74701cefc79d7b09a23b29790575d5ef7523f2a18ab057e06c6b2fea5411ee2a. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/TR7801700096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x170a5a29097593cb9fa94f63886403cc2da79f6e108b8fd079a5487c7abdcf5d. 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/TR7801700097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5403dae38e416f3b41fae51b684e937402929e24e2f88cea2037491015e6cc1. 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/TR7801700098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a2533ed1989d13068708a155c9f86eb2d7660949b41b7ba26f00930494f5903. 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/TR7801700099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c16773317695f5d3a8f0fc01625684858e918b425b14b65d74761f02343e6d3. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/TR7801700100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87913fe156478915649307824c7e11f5c685f8a181d3d267e07495392463957c. 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/TR7801700101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9f628cab193be9db45a2475e9e2114fd5d027dc4386aabd1810fdbfd41565b6. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/TR7801700102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa411e82ad45e49a3c98be01f81d4aed57523966e4d9f2b7daf04c26b6bfb8027. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/TR7801700103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x729be5f206fa06c029994b2f5cec6701ab8d919d4125543049d05eee5fac59b9. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/TR7801700105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e10db4327c42bef14b68841e68592816691a1cc1818010777b7195f97809b2f. 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/TR7801700106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc5b53ed4fddb9e8f536fc036ff0e53a9f881491c32109081528422f033e89a6. 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/TR7802300108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b1f46d15c81ca560ede10f30df5cab760363c7d408cad24ed05918a12ebb07b. 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/TR7802300099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ce3c0f0dd2bcc1840098c7b9e40caf574696852c4e17b09471d4a11c2da9976. 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/TR7802300016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0894dccfbacae9613626f62452e3441b2475585034c3e01a2f99b469814db18. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/TR7802200265.