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 0xe63a0f14023ef07ec9ff4f1e90531c62e887faa4a9e5a5990d989e8b9fc0ee46. Chain 2 (Bitcoin): anchored in block 953754 (2026-06-15T06:45:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/af09ba03-d36f-44ca-b61d-8f3dbb058e13.json and https://artists.proofprofile.net/proofs/artist/af09ba03-d36f-44ca-b61d-8f3dbb058e13.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 0x8746833acf0d212df5da2ed700a72549e5a55bd2bb7b44c84431a6534fc5e9fb. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBRD51800141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41150e137d9600acbdd1e986577047f4cbb7c70be36048b26a5e60fcc2d60b84. 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/QM24S1816875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48dd05d95a810b4454d6095ed55a36a733e827b44af832d97abddea16033d748. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/GB8KE1652771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5de86cd7e9896d52cd1c62359869e6b5a706c4803ebd492101d33a14168777df. 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/GB8KE1653509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2aa57294fc494cc0b019629ba33f592236bf9a8e2f0d73446e3bb636d8f93bf. 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/GB8KE1556476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f05f412d2d8eaa64a239f7a0f4e6d77ccd7439acdf07b5d1c3a41d2307144fb. 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/GB8KE1556477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3266743a152cc17b583497eac4066d802d26782e00ef14673dc13453778323d. 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/GB8KE1556478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x131cbea105ec8c362580e3daa3ade98ea3ad235a0b37440b49a8cadd556456c8. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/GB8KE1551039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf384684181dc348424fcad67dc006b69b392635e4c62f076fd88bf697ab1d2ae. 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/GB8KE1551040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e5e2d92458102602bf286a68f28ab6628beb4ebb4a124f81b1281a03973821. 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/GB8KE1551041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53272bcffac1ef47e1bbbced48c708c8adc7f94be36a19ab7a5fe336e5f31447. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/GB8KE1551042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x815dfa146b2f42f6c7738554b707891dcd55a58fbdc66e87a835beec9ae27d8e. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/GB8KE1551043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cadc886d6b4449e8c5a6e2c6af2f5c140ca4a279f80a5cc6aec6f063a5b1e35. 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/GB8KE1357435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff7985eedaed6bfb06050d7803ec50e714f120f654ed82def23a967d6749e30e. 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/GB8KE1357436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a97d190a57019c6fc0832d690282fc787e5d911c8d8a01b932e5cc0f183b280. 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/GBRD51400271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14b18bc5e705404678b504938c6db716e87eb3729a506d2690b5fd44ab79090b. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GB8KE1354386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a6924c5c7c33fa66f45c7095f547ee6c546e5a9554213cbd9459030657bbdbe. 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/GB8KE1354389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x493db568b199e72c0899fa5759861172661207a4fd46322bf35ee157be2909b8. 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/GB8KE1354390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a982c18a973b04076461fbebd9ee585093dcd7452f96517e30fb779603379ed. 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/GBRD51300195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67ac49c9f9de461f57c5e00276966f22f79197d062fbad61e36ed0959ebfc15a. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GB8KE1951366.