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 0x159f621f31deca36b1c2567e9f31514d0ebfb9ea10bac44a818736f1c93a6e0c. Chain 2 (Bitcoin): anchored in block 953699 (2026-06-14T22:00:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/66805776-96ef-4cdd-a57a-20755e38aefc.json and https://artists.proofprofile.net/proofs/artist/66805776-96ef-4cdd-a57a-20755e38aefc.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 0x50b30c81f421d4f8129551035208f527f2794268e7002d718ab780041e08f728. 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/DKFVB9700101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37684e78b8389d76eddeca6cd91cbef59132e40b790c138566e28e36240ec201. 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/DKFVB9700102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x005fc63ed8a59c94322a0455f439feff8e43e9944867685ba8ff74a0f9d857bb. 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/DKFVB9700103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4717582ebb41b3f2100dae9b73cde700c97f2f9e80dbb23499a0403f3bd0bad8. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/DKFVB9700104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a4bb40554b46278bdfd42de60744a63305f7612a8ccfb48f18abd2959af8d1d. 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/DKFVB9700105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f84670023cd6e89966999f3362f9e97a3fdd8b70faecdc32f3ec48135c26bf9. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/DKFVB9700106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7019e7729d7572050c803682a6ac498f542b06d4680a040791c2f223f5bc2baa. 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/DKFVB9700107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x201c15e9d1ae2915074b25f150880b5eac6bca377d01e8135d3c1f733be8e6f1. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/DKFVB9700108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4454c7993cb1ad465c5e4613aee826dd2a95576c6173208e482e3dc4f088c2e7. 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/DKFVB9700109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x867a921bbfd10e7b99f2ead238c1f1530ee0ded13a15754c1d4d5f859bb0a87d. 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/DKFVB9700110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3390c2c348d2c92f092d013d868b1be87c96c623537b489cf4290dd286a2079f. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/DKFVB9700111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd95670619cf37b2c20b82c1289f80c264d4c156c011e1c8c40c7de20a3c19995. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/DKFVB9700112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaba2ec334d3944a6718247aa19e02912773f7121da02624aabb9b18542b7a14f. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/DKFVB9700113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2ba3d9833010a3eab4e101b123104285d721b46ee0c49500e733fa9fb8f600e. 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/DKFVB9700114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa78bd24693e313da1f6066f8e7d94e58199aa06aa8eb9cdccc30378f966b16cc. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/DKFVB9700115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb954d29a66a368a8d6b8866d07d369640d08e7c711e748c5f622d498eed375c8. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/DKFVB9700116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74ab0145d367f0710f2b1c7202888dc462f1037151d6eb3abf1d2f0b426261e3. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/DKFVB9700117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x070c3402cd8bef5ee0832e00ac43f31c6492eb34d89bb1835e120f239b760da6. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/DKFVB9700118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb29c72291f62bc3d8e7001821ea5c8a9133f8dca248bc44af94bc8cbbbc4cc59. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/DKFVB9700119.