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 0x32fa5b51344f53a4ec9a27938570dbb928289cad574ad0daf479d8c3bbd6f2b8. 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/56e182b6-c8a6-4ce3-afc8-d353fc883f72.json and https://artists.proofprofile.net/proofs/artist/56e182b6-c8a6-4ce3-afc8-d353fc883f72.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 0xc1dd549c47de882a1b973759075509c2981ecd345d6c3a138d1c191630a2af6d. 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/QZTBB2451207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9859f6771ae34b6c1aa8a1c48cfceafacfffaa6e712a0c7e49edd036b067bfd6. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QZTBB2451209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e64599a7c03d61a82ed0a183dd60942544bc8d301651e6d2ad7171270210611. 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/QZTBB2451228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ecbc03e978c0b287b844a08e41c4829daafdee7e2ce4e55503f01b148e4b06d. Chain 2 (Bitcoin): anchored in block 957650 (2026-07-12T04:18:57Z), 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/QZTBB2451229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c87ac80c3ab5cf8b1fb44f80173a56da75aa99d4282a849bfab0e4aecb112ff. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZTBB2451231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fa74e8d8b0bade6cd5266cb18155d3b12253d514c24612ae98d67c58f9a4113. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/QZZ7U2453672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x004f6aa7e7234779a523c31fadab0cdb27b74f8326038f8a718bdd9b64e1baf1. 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/QZZ7U2453675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x528a922bb5516155d7d4d862d75ec1cc8755a679cad9d81b6e5070cca4d7971f. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/QZNWT2593871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x296f97034b54f4a55904e79cd126888e684fdaabb615a73f91e2c47d6559d369. 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/QZNWT2593872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x534dae34efff154e1ca50f62bd6d31cf1db733ab9948cb553042741a76a33143. 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/QZNWT2593874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c59da1cfddf06d0bdb749fb421e08480d1fd6a63b1852de63999a2725b5c602. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/QZNWT2593875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8af68e608621796889f12615f3ec72e2e48a27b255584ee55f85a2b680b6c218. 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/QZTAU2551685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06281f29e14492d4e01069b0dbd3c0183c544a87de2a3a7040fa6e5b1bffa1e8. 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/QZTAU2551686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52e26e8f982bb2c901cbc31c205b8180ccf0ef635014d24f535898acfdf55d8d. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZTAU2551687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30dbfdd845290cef941ba9bca4456905b5dc6f813ce10d8d3d58e297ee5dacc9. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/QZTAU2551688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d2a0ae8de81e12edf91fbe7f567d163b20bb1f2c3a13ac420cd776ed1f4863a. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZTBB2550795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc129188d76efcc4fad02d17ab6db9ba4f83d65f319faa153d9d67d6393ad05c6. 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/QZTBB2550796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00fa1cd44e98a9ee47bbe23dafc7bd6e09fd4b10f537154bd379050686940a0a. 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/QZTBB2550797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd567707b3a930f7a94774b9953df1bfb7e862ad2b63074ace4d9877eeaba6674. Chain 2 (Bitcoin): anchored in block 958303 (2026-07-16T16:39:24Z), 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/QZTBB2550798.