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 0xad2b0e01a0f3145e15ccff69012e7e8732fb57d1de7dc649c6c20462f64a0599. 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/d9cc0b92-2be1-4e53-8e9f-0e754576b8ec.json and https://artists.proofprofile.net/proofs/artist/d9cc0b92-2be1-4e53-8e9f-0e754576b8ec.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 0x388e69ff754870f3a5ef35eab5681ce5c664731c3c9eb533516a8a05987b9d52. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/SEVLE0400101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12f8f6e0ea92919f87160a5eca3badfd4f551b1bcc0fd0bfae93ef17838a0e37. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/SEVLE0400102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b750539f1e7731d0a39aa3238a5ebe6ad6fc143e5c56db084f2b506592c5d4b. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/SEVLE0400104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b4e5ac9dd8d01d78a8030be45b6abdb5cdf2928d1c9e515d4925b52a93e6243. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/SEVLE0400105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c87c89e410973acdfc92da8a94e39ac576a5067c2a8d0091be4c4b526eb0647. Chain 2 (Bitcoin): anchored in block 958117 (2026-07-15T07:36:28Z), 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/SEVLE0400106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47d782e4b526aed9cbadde06675b7f63aaa813b9a77b47e66af95d29c1a71468. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/SEVLE0600103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea9a39e20c2094457bed41cc795fc6de8caede52c11b01df297dba6252410ab0. 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/SEVLE0600105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaca160aaa1adf50001af01b406d6136a5af3343a6ff631cd58e9e5cf5559659. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/SEVLE0600107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbab45818ffb53861befa0f7248791d8bd4c5ff127c99cfaa6bc9ae7f759b5d56. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/SEVLE1000201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa735b8e8d1a2319d0124fd37689136a77ba64ba62a4cc039a71f570f9ff0fb0a. 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/SEVLE1000202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x143c9b33fc3f631eb0771e27c88781bbd6541c3247b3faa7a106e122075b52ad. 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/SEVLE1000203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2ac0900cf322116d19a5bc391e114de29cd565f4146e6bd80d0ba0e0ab3de81. 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/SEVLE1000208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2543f76799ae9e92f4f2a5b34f956e49514425cec3a204a906240850daa9e6c. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/SE3XQ1300101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd164e8fcba50025c4006a088c4119f95e7f5ab636540928283d6ce15b39d0171. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/SE3XQ1300107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x425d09d8c86dae84ab0ef5027343adfeace2aca10ed07c723dbbc6b094283969. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/SEVQI1500201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4aa11fc83c0b31c8747e82a4de6e4a0c0f80834141e8f0065769c08aea8a4d9. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/SEVQI1500401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa87238c3417359220f8158f2e1eb7abecf6ab1d91c92b6cc5ee8adf8d416a922. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/SEVQI1500402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c1345215e7e7da16ecec0bace79a50ec1e8506ea62ae71fa010e119a26cec5e. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/SEVQI1500403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b4a539db411a2e13529070d60578f4a051c9a1e34926a7027037302f5c56da0. Chain 2 (Bitcoin): anchored in block 958491 (2026-07-18T04:29:42Z), 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/SEVQI1500404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d8e45a921127f8ab8df10910eaed3c271e2b799e0f9b9b26ee78eb750371a1. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/SEVQI1500405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x736e2e39fe0804236fcf2bf327926152bd1074c7890036223390b970643eb9f7. 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/SEVQI1500406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9673645449b250e800bc6aa3575b7dfaccceda48d67cfd8e81eb3645cdd8178c. Chain 2 (Bitcoin): anchored in block 957866 (2026-07-13T14:54:25Z), 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/SEVQI1500408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x293faab3a3589ea6f2bc3eb6c88be8e60cb5b850d3d67207a25461f3c8d04f6a. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/SEUM71101057.