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 0xc87fef5cbcd0c26d90705fd22c51bd15fcba648b8fbdb7c8d216ffa6be445855. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5389e19a-1378-4e21-a9ef-62c7dbe8e7d0.json and https://artists.proofprofile.net/proofs/artist/5389e19a-1378-4e21-a9ef-62c7dbe8e7d0.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 0x2812c8e617eef9ad3c67148828eda50c9cdd5fdf3e7737c427201142ca70a047. 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/QMDA62248028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa3e89d360bd0f9129fe7b5eefcf873d794b690d50f45426c748e4e9181fd43e. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QMDA62247953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d6222ae906425dea7643a4722a07280829764a72ac19466f1b86903208a2547. 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/QMDA62248017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9811cf5059c0705b27c874980ff40c23e7d5d4b8d3e06810fca477cf225348d0. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QMDA62248022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95fcace10114daec18c59cd0ecce70ba02c97c92f313a92adf98fde0a21a286b. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QMDA62248024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc950fa8c927a183e6b005e85aa51372b40a3f17a56e5e0600d6a9beac382ca5. 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/QMBZ92290218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebdee1926234d318d166f00ec7e617e3cb640709e059327ee245d22249e7a61b. 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/QMDA62248030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c3a06a320fbed1a93d728fbe4dfd796f922731e68c0fe67d99f28137c9bae0c. 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/QM4TX2230514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c9300f0cbcf2c2209f73fb92d8b5eaf93343cbcbe8b0786580427b5915e9a13. 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/QMDA62285197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf3b67e17c7ddabbcaf6ac429b75680ff66046b9d8ade3e8563f360deb017122. 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/QMDA62289815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x176e7b33e65e7695014a2508feecd799f27318ace6f077f40a7f247c14401836. 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/QMDA62248061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35a8efada6a198388f9cb913ccda7819cf8dc5621c1d93fe2353b35d2d0efa44. 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/QM4TW2221700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bd29cd0fc0287a3a6645f57a5b562df3086bbf4c636c7bcb05314c569f36fbe. 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/QMDA62248069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2a71ab6f5b95008e609cf0e7d8174c2d16c227558ac0f32caa10361f01afcb0. 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/QMDA62248074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4307951843db50c47520cda01b8fb7b4ef22eb96dabcf8c1ed7d433c469fbcf. 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/QMDA62248076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35295a426ad19e73c2adb67e238252726924cecf8ea4532412ad59c0829dcc14. 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/QM4TX2286934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf99de59cb9b6b071bb63b69a2cbe103d49c81388bf156cdec282b461b9abe8f8. 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/QMDA62248081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff44e62920873d9b9a29715d950d6c43c40ea8cd4d899a53c06e37c6813424cd. 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/GBKPL2024355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf6a57da0709d29d9c44076fe90ddae2f1e47b73138f5f4aeb724c43a9ead86d. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/GBKPL2026952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7e78c62688b2b000eb7aeb070c05ac039e9287e12501ea71a83407529d32d5a. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/QZTV32287834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd55044daecd0614a0778739ee6c4e5a6132d2bafeab34610dc70fe855f60a77a. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QMDA62162305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51c36e5e2e2b0b496d31301b858ecd19dd4212ffae8f703c525e8bb6882fb931. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QMDA62118834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x820ddade5cae7714ebc69c95f32adb0787a626b7659a2a12e116c77867bed2d2. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/FRIDO2012406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x426b7a4a112f081f4f9a72ac9352b937f554d09602464eb2cba4e1a2eab224f5. 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/QZDA82018059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf70499f2e16dc35786cedd97e2089b4c01fc151d220382508e3788480014eeab. 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/FRIDO2011828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69cf7702337a416c67934d7456c86fd2ea02c5ca783b62de9d1aab930e94b869. 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/FRIDO2113702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb809f80510148a6044fa4ce8d125f7e4ea6d28f5ec4409278877a9b7e08800. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/FRIDO2113703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x820ddade5cae7714ebc69c95f32adb0787a626b7659a2a12e116c77867bed2d2. 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/FRIDO2012406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f85796c95a2641356683cd7e32b9e247bfd1f6c0dd534d6b899677f7171d98f. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/GX9H32500054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07730f9f704a21cbe93366ca4fb0dc05390ae13449404feb8b595087f7272cd2. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZNWS2233378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aa2644d837a04b94d8b56f11d3deb096d6d2e956e605cfa337750cd46778327. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZNWS2233381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc69997085e559187a7d450936ab9cef33302ed4b70be144155a599c015d53409. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZNWS2233383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed045e5412a4fb5a1c2fa86f0a716100952d82c83292d6c36c6d10d699629e4f. 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/QZFZ42415091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94eb96118686e7f7af898df74f36624e9f9adaef54573a6fbdb7572f5ed7bcbe. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/GX9H32400059.