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 0x3e8e3545199efc05eee73b8d5dc5ffb2d1f06b3e5a1b59bbc217484a271e4649. 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/ed11bf02-9508-4ee7-b611-5fc329775460.json and https://artists.proofprofile.net/proofs/artist/ed11bf02-9508-4ee7-b611-5fc329775460.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 0xbb429355eeb17e556dc55e927fe9b089e426b82571230310acfc3b033c46c98e. 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/QZTAX2433262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d8c39cddaf90db624b388a49cefbbb37defb01fd568c3b2713ef39699f9aab7. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZTB32495910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b5d4577d4de4cb530d622f184abb2d5e1defaa6bc462b7d1d50f60fbf8c872. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZTB32420961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d8c39cddaf90db624b388a49cefbbb37defb01fd568c3b2713ef39699f9aab7. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZTB32495910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccf84ff4d31766977afbb7116ed5b1c61899753eb8fcbded0c21a758269c31c6. Chain 2 (Bitcoin): anchored in block 958602 (2026-07-18T19:28:16Z), 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/QZTAU2450381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ad9e9c94fa745f2659670a63cb76fbe72ca142863dad03e96f56d4e6203e11d. 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/QZTAU2453011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccf84ff4d31766977afbb7116ed5b1c61899753eb8fcbded0c21a758269c31c6. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/QZTAU2450381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x556894e9b7707993523fc41ad5d4bd635a52c77e38caa38a41b8d9f3f0b2ba68. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZPLS2474827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21f2bdf20a42f9108f0542f5b7b2c79f9fb413d624f4ac9b2ba7002a0ce57a32. 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/QZPLS2477004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x523197869132f5f010421c7c00d29304d485963309e96c2e1d68eca0bcf97a35. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZTB82583243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51bffd861a63cff33b9c74927287e495cba6e99cdd0bebe70859fee4ee7d200f. 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/GXHG92521560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ab3d53f53cc3310a22fc3af4decb2ae3e08ad72ad4141901a97ec165b938f89. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZTB92500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29b782c79d9563f21ce9e47d495a73ca46a29b15bac36dc94ec2dfbd0d9cfe85. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/GXHG92563881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7d8f12ce3d0e26918d4430428ad1aeb47f94637375f6996dbe43f5a514ad1ea. 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/QZPLS2459703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8a0c73512149e363c4cef114169540be2b510fb92b574142670cf4296028531. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/QZTB92539324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2b5d4577d4de4cb530d622f184abb2d5e1defaa6bc462b7d1d50f60fbf8c872. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZTB32420961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabe7ea8f057082a10eaf9cbde8939b825ccda724ec83a339511c3ae6cbcec4f8. Chain 2 (Bitcoin): anchored in block 958827 (2026-07-20T05:07:11Z), 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/QZTB32476749.