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 0x75dec16294b0637d8a6122de0c75768fcc8ab54ec206c5b489e9859c52540da9. Chain 2 (Bitcoin): anchored in block 953714 (2026-06-15T00:43:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/868fcd2d-05e4-4901-99b7-49a56dbb192e.json and https://artists.proofprofile.net/proofs/artist/868fcd2d-05e4-4901-99b7-49a56dbb192e.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 0xf951d81ec73306ed9370949f1f5151e9c44c0833a546baace140b50a70a346f7. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ITDF61805023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47bd6ce9e0cd3a9cab30c1cfc80ed6bee9db0c4c6aea34c727ae53bb0fd8e97e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ITDF61805035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45bbadb3da3b6012c2fec58cad4ed7eeead2426a8c2a97ade7a3eb77ca905b6f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZHNA2000880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x279c2b2afae2609588c06d899cd77d0635f8de96fdbcab27c6c9ef0406aa4676. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZHNA2089879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5144b46e4faa146eebe86b863fa3b2e2cd6282fe82916193c1659c7dab25f65. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZHNA2089886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd08910371eeb79ea903549bd9269f7816428f3f1c9dff3d8b1706e060e56c1d9. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZHNA2089890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x934909497782602381e4aa7e59f2fb674aa604d534baa474d748250ebc231011. Chain 2 (Bitcoin): anchored in block 956995 (2026-07-07T04:27:57Z), 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/QZK6Q2032480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ce747dacbcb5a35059ec05593971f4103ac3d5415a10d7eba9ce1d4163411c7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/IT1O72400966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8755d8e2bbb4afbfb94e499ef3bc0160b44ca0b953cddfb947b93ff8847498b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/IT1O72400967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b11651665b79253b2dc14cf011add2bd4c58fa11032130da12d6acc806d5ec. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/IT1O72400968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd26bc2d3fe303a774a1de2504a7c5275f0e48394f2a4311e3ac9b8573ffd88f4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/IT1O72400969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e6b45f2b63c75de19842e5decf407503fb2c28342ad0ce81e4464c0b81c533e. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/IT1O72400970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7b4dcaa4c7bda04c7f0112953400547dad12bb6619ca249c3d912c8a35855a6. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/IT1O72400971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28296a715c75528d2acc4138199586a082972066f4c4c5d8e9eeba905046c4e4. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/IT1O72400972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd97922cd1e4987c735e7abb8c94a651e00993e490ed56bc22416b68d3abbe0f7. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/IT1O72400973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd4ac1792c79b6eefa118b24a4127ec85abbf8626b435cd86cb25aaffe0a60b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/IT1O72400974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4694a6d14f76221f412469441ddbf7955ff16289bda14a8b3778b3a2fb9d250b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/IT1O72400976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc57c081877066ccdb18ca73c35793c5053b2f3a5f1b75266274d9220b793b52d. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/IT1O72400979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8444694294ee383d4c376ac218c88c01d1bf14426f7a220d2ba7f6744caf9d8. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/QZHN71955908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97e9b36f6035e51df0a003204cd6c5d366519f95abb9cf5deeac2bf394daeac6. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZHN71955909.