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 0xabd4f02d3edb9de42ed1a8b23e18909962c107b02544a6a94c51ea2af0f0dfab. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a5ad4f49-4377-4447-8080-5b7bd6721a67.json and https://artists.proofprofile.net/proofs/artist/a5ad4f49-4377-4447-8080-5b7bd6721a67.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 0xff45bd38bbc6161950a35fda5bb28f6812720dc2f7e086bd1ae1883e7da372e8. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/GBKQU2388998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf8a59845c8abeeed69baac86a038fd913860d8b98cb7841a434fca443149aa3. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/GBJAJ2200371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c55fc77af9bdbab258856681909b11359a8c8ba472b0eb39749854650deeeb5. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/GBKQU2168503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa437eee171a236a7e926c4992ac902b915989df2a83313b47167779c46d63df2. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/BXHBP1900849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabc7875fadd1f98fef809c973e53d6c77ef69182336217f5e85b48d7c855ea74. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBLV62309684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31dbce4e6d9f01f4da8bae3d7e030886a10a6fe7ed85c285ac22f83453ccaeb2. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/GBKQU2383216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc15ee0ad1b13c525e2fa4287cb84826cb211840b7c0c6e6fc737fc873306085. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/GBKQU2383212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46585e549dece8d2a62d8c66fbe977d728c49cd57a6a2bb292aad3e28bce3bbf. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/GBKQU2220111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34a1c5f79375682c1c1261931bf47b1c3e96155914a04649ab6781776819305a. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GBKQU2220112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7001cd5002dd091f3199d7ad6bf9ac73c2843f334404262490556d79f410be16. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/US7VG2219091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xead9f6fa0b25a16011e782d9b5847c771603027be194a75eb813042a3bda996e. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/GBPQS2100198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa81d14c3f4fd2244078b105755cf8a18fd14fc2608432387aace8cda1b7b5a3a. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/BXHBP1901104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba572c20afe674a3f7d041898d754b218688a3a735fa52c9eb54cc06b60d866b. 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/US83Z2113220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb094452706e8184db7b4ae23caba0b5aebbeed3ab9e9276209775dd2d42f795d. 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/GBK6Y2159914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb87ef5aef35e6af74acaaad04fe67a2dc13f545499fb16f4c7720c8a009ecc94. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/BXHBP1900753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x591265b490a4347967f66e9bd642dcff67955d10fd74ff9faed21d56a5204253. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBJAJ2002693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5027704815e62f2b95dc7ad3bfae95e000959b02899f2f8db2215770a9544777. 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/CA5KR2102539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x759957393c19612fc96b1a4f2390e61df5614aabf6aadfda3c4dcb7ca19be6ce. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBKQU2068676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9510d273530fef0bf5ea6e065635dd6fdfe4980d2dbe123233c5b42c879eacb. 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/QM6MZ2069203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d0b1a3193e0bafebe99aea3c61359799b215705adaa54e64326a0ff88fa4dc9. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/GBWUL1909974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b1ebdedad18c43fee62b390e5aa4249d34493430dd46d71a95d70e08b60a072. 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/USLZJ1985385.