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 0xf44c99ea7c2db462d07fc4a74ea4673f92e0a4bea10a61339a2c650d5a0e531c. 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/fc3a60db-6dbf-473a-8f93-d3d95a100897.json and https://artists.proofprofile.net/proofs/artist/fc3a60db-6dbf-473a-8f93-d3d95a100897.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 0xddc515d62c02e71794d9628ca7d187746ce4ae323dd53e8a16bbce98ca2354f6. 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/TCAEH1925948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x937f4cc2989ab63c737776bfe16e33d54e352bd41846d2c075d79ffea1a1c7c2. 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/TCAEH1925949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d75528ccf21b2a15bc99125f3aa0526ad1a41cfd6c3d39aa567b52f73adef0f. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/TCACE1545847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0f8bf6b5ecf8425b848f4d4ea8a560f73f15e3c73b45ea50412fba2e16769b1. 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/TCACE1545849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6749cc02536a80293c96f4cf4f78589205f98d32b124068baf668a55a2bde381. 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/TCACE1545850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd426fe9e189ac4a2d5525dbc64e14a89d2ba666b9c839344f511c049f22cdbc5. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/TCACE1545851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04824267e29988c870874472c44b221f671a064b1b5dc87c223e4b26b9f8b51f. 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/TCACE1545852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x642f8415cc7211aaab87ab019ccb404c2ed8278cd725edaec418556f3aa5a456. 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/TCACE1545860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c4aaffa9e2f6e01b2b28a0db3c9df175a0948a5a109b91e4fd956f0ca7d74cb. Chain 2 (Bitcoin): anchored in block 958496 (2026-07-18T04:43:53Z), 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/TCACE1545861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18f66f7ef0b240e043f30d398a9fcbd8d4dccd44b99e018fe4682cf3b56893bc. 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/TCACE1545863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafc4cfd35acde9933195187d8d44fdab8d8201fce94d10377d7db58c526e31e1. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/TCACE1545864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b4665250ea6ca1651a06497a13b5cc9547c1d8124a0bef007414a003bf3bfdf. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/TCADH1755555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68a9f58f07253bce5e6af5d43dc4270b8f0499200d15fedab6a59cc79e525e67. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/TCAFB2074836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd83b31305fe73a9dec73872689a11734d0aefd83fb53f28cb206cbcf4e48073b. 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/TCAFB2074870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa517e057a8e3576a11c58d8f956747c0df6cff08acfeaffed8a5646004ca707d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAHZ2437090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x110773ea13001ba61db3f9148de275725e5ec132496f225ca2fb18a4d263e48a. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/TCAIE2449404.