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 0xfbcaf37a006c95c9fcea480103a9894739a2887dc97bd2e5856aeff40ffb6c98. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e3390b4d-01f1-4f8b-8737-11dedf680468.json and https://artists.proofprofile.net/proofs/artist/e3390b4d-01f1-4f8b-8737-11dedf680468.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 0x4534cb7417aba5b2f0a6f48023c08f1ba7c6aa5ddcc1b9154c1f849127f2b697. 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/QZFZ22373670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcce2e893ecfce62aac39c4203e1e6d7d693d7e37b838a1253a2cec1ec677ffdd. 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/QZFZ22373671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe453cfb757da41cedc30c8a6ee630acedbf276ab690aa7eb75b54504a8dde0e. 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/QZFZ22373672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2406d1fda6943296fd49b5a66b89b1c0681c6019ba585c64cfac1fbe6061d2f. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZFZ22373681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7b7bd6e23dce6d4a4fda40f6ca7b6ea3fde743cb444e1e0a6db3a44992f570b. 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/GBMA22016050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x425a65e7eef37cc88198df100a807dc0dced2eae44d1428e4b28634ed7ade0be. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/CALVP2028901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8d9177d5debb5cc555c547ce2b42a49c409a16bc692ab5fdadfa4546b101023. 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/QZHN72047605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x649365673728d58d9267a9e0f5477b29426aec7f9f624a3e2f178123d3063662. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZHN72047609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee9b716c6511f36b68a7bcef451973e0d4a6b3b135c5475d772a920794217932. 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/QZDA72120348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe23ae9728b2c44b83c2a9119c7a3cbab4e260c29fd3d20ba599ecd64d35b8bfb. 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/QZMEN2095362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e7cc200df9f7636e075f7a31c075783bacf7f57c0909c298b0b96e9af8ce63e. 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/QZK6N2039989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16a1b33f644288f7ebfb1d91c16dbac00ec18b789b5d33b51abaf4e985afa075. 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/CACWV2022152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa49d6b861e30da4f43ce44ca36c1e577257f06ac43f41a8f7fa721b6faa66af1. 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/QZES82061856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6d26c7b1ad40c1e1a08d7693224e925b2dcc12f739c33c2f67cc752e255eb2e. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZES82061857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x642589d1eae08681e288151bef39e6fe11eed6c7f742289fb72f090df641dd5c. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/CACWV2066990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02d15e5f5da679f8486ec495882551fa6abdf2d2fa9fde7b5311bfa229702fd2. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/QZES82061858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80d6a70951f6a11a745bb86322ed5da1fa215ff98fd702ff1f8d31ff9e0e4c54. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/QZES82061859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf376e4e2af082d41808bce2cad2fcb5ceab187dfe39d9e6088742c3a1a98acb4. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/CACWV1981139.