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 0x5b34c74fd477a54c75314626e6ff6850a6937a97c08522c93206a0937f8a1946. 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/d646bfac-a90c-4cc4-a613-d9f821e2a595.json and https://artists.proofprofile.net/proofs/artist/d646bfac-a90c-4cc4-a613-d9f821e2a595.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 0x5f2ee8fcd74915068a47822a1a7ccf5fc0469047598e62883a88013f1be66ab4. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZ5FN2262787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2100aa8133055004eb85fe4a4908babeb076ee1dca069fe9e9e99c3f1e01897. Chain 2 (Bitcoin): anchored in block 956775 (2026-07-05T10:41:06Z), 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/USLZJ2265591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61ec99de21fda52928b497b60131dddbc2472598b91a53f203af60af58b35120. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/USLZJ2265600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86552aa00124da640cc1630828c8013f0fc3927e262aa609fc902c7104f5be8d. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/USLZJ2265603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda483ef43c4eeaffb6e99c416b65a66f5ea65bfd2428ce3cc7091b8a17e9cd3b. 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/GBWUL2248742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7fcebe7043a05c1374923a6d5aafedaada5900395d2a9ca2c10df4748a1ff13. 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/GBRKQ2299323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62d70e4ea56f7cc01bd3d1425d789a87d0b3bc61ea32d84eac89189c01911a10. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/GBWUL2248745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24b59188933780d06c3db0cc5e0e5265da53d1558094691ba12479bda60ce3ce. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/GBWUL2248749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3ed4e16373fbaf4c6f0f1c87735cdc4973e53ef18b67565a95b0bbc1e69c45b. Chain 2 (Bitcoin): anchored in block 957579 (2026-07-11T14:35:38Z), 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/QZWDD2215449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x673ebad0b9b40d62b26d7bde3b68c7846ba8825b99c5c1de1c533ba803aae0fd. 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/QZWDD2215496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x146247f1baa4d64c7ee04c6ec0370852d9378b8896399a6761079d28d8aee8a5. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/QZWDD2215500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff82ead57b2dbffa649b4fab21b8a9668ba025417306ab9fadc93bb1628582fb. 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/QZWDD2215506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab295ace14782b2fdcdff08ccc41f8bc7fa70337a49a7bf95fbb57247da3ad8c. 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/QZWDD2215509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfcd06ec796022a329daa73f55c708d7a7c4ab9dbc6ac28eace9b0a32c8e9e9e. 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/QZWDD2215514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a9d24f43a6de2afa82711a8791f56984022d0c764becf436e4ad5988f5111af. 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/QZWDD2215534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fd30e4cf8954ed2961f2df32b0f485c6772c2de983544d569603c16c6b6ec2c. Chain 2 (Bitcoin): anchored in block 957576 (2026-07-11T14:19:48Z), 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/GBRKQ2365567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb5fa7f7dad8accb9a769d440db526156a3c77fa5ec9961f09cee958b6bb1079. 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/QZZ8A2396507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c94f7f01d7a6f54ed2eeb55643fc4b3db83127f520746e9f14b823897573e19. 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/GBRKQ2482572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0897fb6a480447212250e4f90d94979f9c6297845e61e0c9fc70c7581946ec1. 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/QZWV32552408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x624bbc26f7721cf5705f6ae6a6b9bc926ab5d55e5b1a928d843225dd21582b16. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZWV32588290.