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 0xe6ad4679bf60dea806ad58e77c5f07a9474cbbcd26c85379effa22c4d373b0ac. 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/727f9e38-2b0e-4b9a-b2f6-86b3f7bd830a.json and https://artists.proofprofile.net/proofs/artist/727f9e38-2b0e-4b9a-b2f6-86b3f7bd830a.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 0x8c582a6fa588ca8d28a6c418e9ea96486a3a5e1bd99e36b839c339d7d21c3ee8. 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/SE5Q51820265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fec39ba5f98629db5f6c4f3bc7d8af0d63c57879dacba6fa37f2dada9e3d40e. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/SE5Q51813675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0202977b4865a47095882b92ee914b3a20667e774ea1dc7a23c5aba5b96c16f. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/SE5Q51802871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x294a52a1ecda7bc2a64a46543d0c93bdb3610ae77e0c86e26d3dd57151ebbd1e. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/SE5Q51824283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2fe7b1f51292c4f08b6b035e593217819b54f86e34f47529ecc9dcc8a10d587. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/SE5Q51815551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74cf245cdee19b718c241250076290063269b3205e6349e65200b04621651f86. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/SE5Q51826002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f8fcb7ce5b46000ac0db9e003599fda60eaa1ed871cf41032defb3dd12f1929. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/SE5Q51814232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa63bfe07c91aaa437ce3893f3b645e539102eaaad7119b2490ec882cd7ca8103. 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/SE5Q51817597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44049c5a248f0d15e829ca6e5c67ad110cc74dffed9cfdbaacfd99a1f94ce890. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/SE5Q51824901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb11d2dbb54a4b30c6bea2bd2ca9edb9c356b849807033bb5a5ea4b15833b7e45. 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/SE5Q51819046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c9bcee251ea3dcdafddf5327acfb089867dda4c21b8167f2a3f861c100dfc73. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/SE5Q51801799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fbf34f2db2ec803ededd8fbb7d3cba84f5d6e4824e12ef2de9f4b242c22cecf. 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/SE5Q51815124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c8ed9910cd7a7c44975f01fd6d56de5af08e3235da78516c9c990a7e8dccb4c. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/SE5Q51816534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20d8957bbe9d4f5795f4f0e61cd85e5f7433722b48dd590b07abafd9a822b996. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/SE5Q51807915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8adb0f059a594af4e47f90cdacafc1710c0ed1eacaf50c0a22f7af880737e65e. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/SE5Q51801624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93810d02bdcb4c7b2c41c32bd8c3903eccea81eb139320e7c109ec6969b98b4d. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T21:33:10Z), 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/SE5Q51807960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f3d31065cd8756e48466879db38fa3662dc6d69f4f802773fa2d820e37ebc76. 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/SE5Q51817727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80be41ccc162b57bb76b58cb2fc9f9b733255d25f25f301f4adafa7bc4534ff1. 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/SE5Q51804421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0de2681826e4a5a1e84079fbfb70e119ab399d93807903ec6aaa2b4416a1166c. 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/SE5Q51807375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76aaaa5f4b2cd082929cb4451c9881e6a902bf59a3f4862b2e8410c4f0548406. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QZN882581439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64193c93af34dccb0050c1740048b693e9fc6bd1f2b2bb3f9179c7dc03aabeec. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/QZN882581440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41098599d7427b3b50b0db06183ae0e3275300deb6d56403e383847a191716fa. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QZN882581441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b672983004d06d94dfe653fda69e0aed937bd6d466746dd1eb227516c2e864. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZN882581442.