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 0x8acdb1d064f7e2bcd56ef287a599d905c9404417d801ff0c07d9aee213aef396. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/939cce1f-dda2-4123-9dc0-e8d626153aca.json and https://artists.proofprofile.net/proofs/artist/939cce1f-dda2-4123-9dc0-e8d626153aca.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 0x72a7b81597bb533bcf5a4f89931ff96b8337dddfd0e265f41807fa1e87af1b90. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/QM2PV1872673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x332c912cfaaf469951ad7bf8d5bffe9e1a8ff38a4285f7150927430e321d8d39. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QM2PV1872674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf1187f6bea59982bf52ad45bfdecf03fd141acbd6f8832d48af89a2b3c7db1d. 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/QM2PV1872675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeafa88e56449ac4a27b1df3055dce67af3012b04126b7405905cee5b0fc10296. 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/QM2PV1872676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a47e6d1a0adc5d6855601271d49ec7372b12304e2b71cf7d870228dbaf1f0c. 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/QM2PV1872677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28a236facfd17c35d60606127f17a36dccb8b6e88353cf13e6cdadc968204104. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QM2PV1872678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf262e23d49dcd1cca3a8a96d4f2d88539308a4c83cbf3ac4298d05fecd1686a1. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QM2PV1872679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x394395096539efb6f239c15e0ff67860885946244b78848b3e030edcb4c1380d. 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/QM2PV1872895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb0eb2fa17fa21aa67abba2362d64caa78778f16063914df625e64441132c10f. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/QM2PV1872896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b7b7bd1aacd51ac5e09e203edd7fd2406708fc7bf1f9661c3320779c330028b. 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/QM2PV1872897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd8457252949f86e563e3e3c15ac9f5e3d07940e2df177330a02759089a824fa. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QM2PV1872898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3eedad400606ab130b1aaee57e1fdff8001d6b3dcbd5eca38656b49c5fdd022. 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/QM2PV1860180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb53c04abb010e4e719f90665911b102ae4ec1eec75a1d2c41ef3648c7897ab78. 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/QM2PV1860181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6cd8efbb517e15f55ef81bab4bec37564dcee7b9c85ccc7ea4331c419dd3df5. 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/QM2PV1860182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8c34ebfaeb90cbdd3d4bb126dbe51f39279889d6c68c54e2768fd4e829e1d6c. 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/QM2PV1860183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b6b4106e39b11a02545a48cca51aa5064574ce0d0db75c254a7535c0ba6c43d. 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/QZES82078631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fb60a6aa12291a9d15b8e6a9be3d6a0a33afed135b32b017204c7472f448bae. 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/QZES82078632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7d10e0c5fee8f746ea1c5621cc33b713ec55a8b9bceb712ba2818237465fd59. 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/QZES82078633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x063597b233f73dc23612059cf2dc407c1ed7836c7d8124bd9aaf763e82b30cc9. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QZES82078634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x559f04340b2ea20be0f8b2184eb26da0d8de1987f769d4d950a996acdd6b4351. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZES82078635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3914ac2835451259e836a53577f5f7483ce2f1a5e4c4147c0208aba825c155a0. 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/QZES82078636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcec9a7ab167eda4bb94af78b241a14372659e4bf719e69e27bb2b9b43463fc9. 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/QZES82078637.