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 0xedc9a1a98b5d0e8e372727de6b094ecce593b456e8e16d8c1b98c72c467323a3. 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/f1e95c08-95a5-4466-82f1-3b25d8d4432a.json and https://artists.proofprofile.net/proofs/artist/f1e95c08-95a5-4466-82f1-3b25d8d4432a.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 0x3cefd05cc1c31c679ffcc5d93802a6948a3bec1dba320f0f3af94470c55a7c09. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZNWV2054874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd407e7401dcd0ccf5dca8962eed2557a6a875e8880ffae66c11c8202129c28ac. 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/QZK6H2456754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde3433a23265a49e9f16a6b08ad5aa5277b811a36b189b6797627d3fb3a5c0b9. 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/QZMER2451065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x127c1400321929989d111bb24198d2e46cd8d8e562dd68d790e8e8f1870ed73f. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/QZTBB2409447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5489987ff7f0824cd7ce8405948d6a8a92760f9f7840e984cea8d04fdf6a50db. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/QZWFL2407169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7133db0d27dc02b030b2b4182c1ccda95c23f8caf9bd6bbe5f444f68cfa06c80. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T23:39:58Z), 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/QZZ7S2466834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bfcc7af9e1539f52bc2b9d9e5f4246112bdb66cc55c68f1d1740155c561ede8. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZWFL2449389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69dee330ade982352e78c7bef80e533d80097b25d1f9f7c3e663c4ed0557b39e. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZWFU2473517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacfdf3068c19bb93ba8eeeadb8a4a5311c765927ac755d4b342b04fa84dcf175. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZWFT2484441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x144f2eae64f101feaeb83776beb3f1e063b6480d936fb4d9802e3604ad230f05. Chain 2 (Bitcoin): anchored in block 957587 (2026-07-11T16:48:26Z), 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/QZWFL2416875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc82fec8d531b3c38dc79a4e939b1704a8491b6cbcf04461a6050f6df552eaebd. 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/QZHN92522058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fa6f9033fdd8b12e209c7717d5b872060a5c8cf156d3b7dc30c05f6a4cc5fff. 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/QZHNB2592115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc457e9d3f410d15aad72830c8c92aa51c5381ea37652b1a616721b4463b30e88. 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/QZHNC2575137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d1206c65e230b69be90469116af417e43ffe1a51317778568b53277ac58eb74. 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/QZK6K2513304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4cf8e08b8626be041f5be8e7694c1e641ca2c60ba60b91dda0f11465f2fed82. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZNWT2571271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d5b2200bb3826eab5d452e2f97b17e683de6041ea2a3b3890e7b9b832deb55. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZTBD2573333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42e49fccf982a280b82c0d301e8c10a35f464fa825eb3aa8fb9431bf31d7ee7a. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T21:50:46Z), 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/QZWFE2521182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd2295f0d37dd026a5912d4fd3882518ee2e11c17b4a5aa8ef368be567cc43db. 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/QZWFK2558943.