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 0x6cf10364f3b2a451f6ebd11b70d7a548cb7bea489b949e47ce79e3129e1659e0. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b2b0414e-62eb-45f0-8fd8-2d3ef3281db6.json and https://artists.proofprofile.net/proofs/artist/b2b0414e-62eb-45f0-8fd8-2d3ef3281db6.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 0xead3c06853198e91ec34eca1800ddbd1b8a5651e54d65d7008f3ea1ad2afbd71. 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/USX9P2413277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1243dd7b5f6a4ee185f94b60d85e994f63b80dd2d9b348428fa3dedde2e92ac. 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/USX9P2413278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x691e98f69c1f54e5804cea9f80a8a581f11f248fb5d324f25175b712806ba62e. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/USX9P2413279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x937be5945d00895ccd86d1046a64a6a11627583a89ddf270aeb3d32e3d3ce0d4. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USDY42409649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01447f77e76a6889ad6b9f412938ce315711b7ab91335dab6fef3fba838105e7. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/GXF9Q2445063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x861db86e07c16fe0f57ef8d387f18ade00c4a6e207f11c9a19c2da3522a670ac. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USDY42355671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x280fdbd405f51f41469a2ac61885c6aa3690dd97370c67bbc71364a02eeb2dc2. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USHM22146117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e7e95e9f5c300bf1226cccf4c8e7b9396398864dee3b8f83725d3c7e642f52a. 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/USHM22146118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca9095c7ba4d6c890e8d4673b8c9ac47f0a957bb04f390071f7f7767e54b665e. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/USHM22146119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf06579cea297cd5ccdbbaf1adc360a6217a4c03b40ce2c6b5646d66d421176c4. 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/USHM22146120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e397fec6cbc700fd23a2448431a1a9a6615a4e18bfead13558c5015d74e3585. 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/USHM22146121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41e389215637d4d2db661476e85c40a40784c52edf68552a22d46cf9f5c686fa. 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/USHM22146122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x937be5945d00895ccd86d1046a64a6a11627583a89ddf270aeb3d32e3d3ce0d4. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/USDY42409649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x861db86e07c16fe0f57ef8d387f18ade00c4a6e207f11c9a19c2da3522a670ac. 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/USDY42355671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb47cce2fe1066bb24df5937af7012151acb1c70f88781535f08628b57da8b17a. 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/QT3EY2411213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2312a6ad5a19462cdf4c573d78b7b5adf74bb18ff16107c414feeb0216cbf37. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZES52599614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3a01d9f6583ada2c1f55d2cf299f93932076838aa7840c9f65e7cb59f45335a. 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/QZES52599615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d2b6ceb47056c31f19eb15d8860326f10e23c2cda336d2c80a1ce2ede6a18b3. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/QZES52599616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95800440f629812b24574a81cb9044b748341750fef4822c3ca392f3cbd32425. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZES52599617.