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 0x3a5957f6f69d1052795487a6de04d771cd3e49e15ef06a337d3ee8fb351cd25a. 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/0e3c400e-f99d-4076-b252-742e8b542c75.json and https://artists.proofprofile.net/proofs/artist/0e3c400e-f99d-4076-b252-742e8b542c75.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 0x3219ca9eea84413af30010979cb49533c0752dd2f5a0ae9f92cec39ae75ed945. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZNN22358892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed517ebd32a1a166f50f3381ba3448780f340f5973a53d256dff7ffc2510826c. 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/QZJG52469857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaca9220f008e511467795cf9c223951f733090a77a066378e1cfb7bc5585a2c4. 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/QZJG52469858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x990d0935e5a0ee06714b3c94ff43ad0cd06e09af0c327c1fd30a94cd5b615235. 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/QZJG52469859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77fd28775681d38d5a08ceab24185352ebfedddd651c9973315b3276e69308f3. 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/QZMEV2497415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb7c7d8a75a8e7b9e39a81f305280d3eac587ace2aab63b400f0eba60c7807bd. 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/QZMEV2497416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe73157090cbdcacefc20695cc5d156ac76d6ca949ba1d95d0cd2f7fb7e11ba94. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZMEV2497417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3368eeb2bfcbbf61f41eb1b1e8a6e642f5d2d9054b330d170edf2a32435ec873. 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/QZMEV2497418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b0b1e3bb1cbef577d81a2e156b438cca2152fbc5947aaeb63bbb5cc19e94ffd. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZMEV2497419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01dc91c5c972fa3f3f54efa2d9eeab3e11a09217f13015c02582793d858b2e46. 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/USLD91764528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e22ac6cd1493e44e1328f3c414c6a858e0d56439ec9b2ccbe63f2c030556d8b. 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/USLD91764533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb37ceb94a181e0054202db9e0e63f19b89ce6e05c0327f786a0e3fc7ff3516d. 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/USLD91778146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92501494fc7040e93939905c41258133b1acd1be3a042b1414ffe860e3fcc66c. 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/USLD91778148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x615592d0afb05d4eae653111594f16abdcc126ddbe84397322a9a9f7dd78bd9f. 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/USLD91778149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x432cd63d2ae8c37f5bac337c5455f22c7ded92e628e99c2a0b40d08ab804db07. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USLD91778151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ef07dfecbd8e2b115d63b0fd4912d2c011d774cd998ebdde8ecdbd534ecd327. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/USLD91778152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c80f5c9c7cff8b037433412832dd11581496cf049e379f8c1f83302a80dc2a1. 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/USLD91778153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90bb8bf15fc92b830162c611b83edb4ca408d5624ba70cc6164d95e694ee692e. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:39:11Z), 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/USLD91778154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x559d91b0d9b264f3a10f87d2484fe1dc8face6605acd873ab721e6b671f36aad. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USLD91778155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81efb34a965f943b2bccdaabd3e3b203d361a07ef669beb4f5c8bc30f5ea6772. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USLD91778156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa72a769f274768f88873025619e733c9fb9b1c28a36b017094242cbd5411d9fd. 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/USLD91778157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dc096cf2af560093ba820ed5e29f7189fbf95636cb23c32cf6590e29a88d235. 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/USLD91768298.