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 0x1cbc827002afb648a1adb468de628c60f9f1ff57f055fb11a6df29cf9e0b9357. 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/37824059-2d13-4b43-b501-0a5a7e850513.json and https://artists.proofprofile.net/proofs/artist/37824059-2d13-4b43-b501-0a5a7e850513.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 0x1e1a6da8ddefe7e02c1afa830d4029f0f9bc742d9e787cb0ed31228cde251e11. 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/QZMEP2201733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7220229ff19f27992266b1eda2b4c49a4342906bfe3b3a9d0fdfc3b783c81b8. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QZMEP2201727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacf32afd1381128de69fca3bcc2dd21d2af2c163e18874f3826e0ca1120480a8. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QZHNC2245780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8af3215682ae42d214fc7ad4dd2071560dd477aeaabaf47faed42c2725bee5a1. 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/QZMEP2201739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0ea2bbaddbb7c1e1f4d35dc5bad1bd24426e54b3461efe969a17a1db601f2d2. 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/QZMEP2201735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61bf2e3aae3638f34fdb5fa1a37ff97b81a061f8a36103cd487e9fb13576ce65. 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/QZES72358246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83be0c76e5de606d4d2e1749bbb0d23cd9467ed156f468f2eda0413ea9b52273. 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/QZHNA2327258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f15da323bccd8238c8bac9e11e0b89bfb2ec5e65d6c8b4753e99bb3f88a4931. Chain 2 (Bitcoin): anchored in block 958487 (2026-07-18T03:43:59Z), 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/QZHNA2327251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3468b34bdaa5d95861d8d71124c7dcc814ec4da141b86c483b742409a6305cd8. 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/QZHNA2327257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b5b1cc9a27149b9bb3d2ba8437646a622e26bfd2e509e2670792c962851bf17. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZHNA2327506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cec9c74892251d42c32bec32af3b786b26c28242453470b50865811b2fb42f2. 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/QZHNA2327260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf16fc0ffdf681c5f2608aa5dfe2e33e1af09e07813c811e9cf70f5273a6e588d. 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/QZHNA2327253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69831e03680d1c581c6c746596db27d1cc1736348e95acbe5de1ef208f4046a3. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZFZ22403745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e4c961bfbe830b2adc225cd66372405768eedfcf3e71e3cc7f09c4d30743617. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZFYZ2498960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x587c013c39536f9cc1c8d86f05eef821c964708d2064f739ad6c4acc1261c7d6. 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/QZFYX2208994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c5ac6c7c84eb98fb62f11c0d73f023cd8fd52d0da46e88f2762536bbf1a48f9. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T01:09:53Z), 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/QZHN42528506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39c81b6bc94b08567e81461fb61685914f2940b84c15abc2b1386accf675cd50. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/QZK6F2591631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e32809d7d00d263670d2b717a44482f2c2bc034cc18b408bc748d11ea4133d6. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZZ7U2562121.