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 0xb489fad9b0269512592767be67ca8fd88896877444f7ae8919b0170b38bf662d. 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/fdf45653-c369-4fbf-864e-c320852a713f.json and https://artists.proofprofile.net/proofs/artist/fdf45653-c369-4fbf-864e-c320852a713f.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 0x53db266617d44dbb1dae1f15d279b6a738dd22b82d9baf70b96d0b7ee1c27be6. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZHN62138313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95f4cac133bb74da10e2a81a31fd739838eebe8d2d80a51817c2cad6db5f39ad. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QZHN62138314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06a96c0d6d21d33545b1cba1f483630d85b6174dfc941f1f7abf93b0ee209d44. 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/QZHN62138317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03fe15515482a1fc72e8fe974bbed01de4fcb9f4cab17a4c4f5ddcf5499c43d8. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZHN62138319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd6a835f4f5313a407747c3a4252da06c65c59e1ed7bfaf38d8397fa90ef543a. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZDA42286656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x002aa99677e92b1fc1e22c5fb222b77a33dedad50fe0ad99d27faae71f393ad7. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZDA42286658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5d64dba17c499e1efd5dc9257545a85996b0b10d37a27858432e02167200196. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZHN32208908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c14972cadf1b38d6d383d32a2a73a78449e1984c696aab008afb2a7dcd5fa8a. 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/QZK6M2217534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe77e2aea6467a7cd9157302eb14f0f06d8cb88cf50e7598c06cb9c19bc40a31d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZMEQ2251382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35f8d26f8b249a0724f1d479967871f88026c809918d16b9271b8889dd3e2c48. 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/ITIWE2201145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3f206dd702e0d9666ea2d81591125234f0e98c5cdd45041eb1207a6bba02648. 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/ITZRF2200058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec8952ddac2dc8e2f8036b785d20c2f9de80e24788f0f6525a2ea398ce4afe87. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ITZRF2200059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d25e39ff0f0f425a0ee0c6d5bf4c08523a4a3cbcb3659b105024a39db53a8f2. 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/ITZRF2200060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d52f6df806ff8129e921cc429b6492c350cd9075dda4760ecda1064acd8a7b5. 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/ITZRF2200061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09ac44ba7931161e88337258e6d10a8878fa016dc3a8b5e3c2d5da8c4d1293bf. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/ITZRF2300019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf686fe595325ade2535adec8ea8937604bd101651876d851cd17bcae19cb246. 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/ITZRF2300027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe723c9cd501d1aeae48a3e5d18cb24d0eb69bf7f70d9c5ecc3cbb3b59225af6. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/ITZRF2300042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d67f895d6465dec5c2a56f09d9df773de176c9b8738c196dbb6cad564ec21b5. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/ITZRF2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x961be7ffff3fd151a6f3a36b4d33aac8f11891eb7f16e1135f983c36f73853c1. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/ITZRF2400047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e7f89b7e8a150454ba48f9f6860b1541d43ea4fa2b81c9592b14bd2dab83f5c. Chain 2 (Bitcoin): anchored in block 957884 (2026-07-13T16:55:06Z), 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/ITZRF2400061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75676cb59dfcfb9b7442919d2c30b9f430eb3676b160340b011fdca2fa0557a4. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QT3FA2505378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7b39ef9dc259e7bf1beead527264ee59cfc1532e703c2da064c0d9741dfb0c2. 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/ITMYP2400030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a6e68a2948fd1eb6f3ab89fb65266b73dc6c99c9153093292704a4b74a6d0d. 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/ITZRF2300093.