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 0xbf3571e00ca4c570a2c89072a92efbc304f6f7be9c70fcf8812d56b3e25e827c. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/936b77e4-c4ee-4d91-9725-9781310070e8.json and https://artists.proofprofile.net/proofs/artist/936b77e4-c4ee-4d91-9725-9781310070e8.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 0x410c3c23d34c41146e18c8d3b803577c2cdefd00a95a2a494f93794d2b9a17a3. 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/NOHTR1603020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72c54fc9157089e63d64028adf8a5134ed6bd50fdac31261d963e1c8b558b27c. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/NOHTR1603030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f114c3c62a26bb056b760b5a6c9615ef4fb525037c049c2377a388a6309c20. 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/NOHTR1501010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2dd18e9293850414be6e1136831880747d09df96321bb1e0e0b0f944ad09d4d. 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/NOTHR1603050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08286dfab677de887bea35244cc3fe89b3cf07813a4ed392f2a328e8178aab46. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NOHTR1501020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24cdcf8dd6ab6ceade45b77e37c0ba1656c3f4041f4b141fe644af2ce0f8cd3b. 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/NOTHR1603070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x696092350daf7817109885591a4ed4cca64428a997b61c9f0f1178eec5eabf0b. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/NOTHR1604080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x125ab844df65872b3271e5db9d20b2b137a8b03ba8e5e597e02236e0f37a0fb7. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/GB5EA1704746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d6286c166ad2eec4898f01725e8fd853c154bdf214095e9da4a8aad8c185b57. 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/GB5EA1704747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbc4b28fa61ff4486a6365022753106529835a48f3516dcc54834898bd74118d. 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/GB5EA1704748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c875af10286fbced84f83579865271e370d6bf416e9a26a29987777460fba78. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GB5EA1704365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b1feca994a65570a1b0063fb667ae46bc0362762d76945a9ebd3faf403e72e2. 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/NO26K2414010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d0b4bbe6f8f826dbefbc39d6c0fbfe42eddc8bc2390b4736c8a0cac4d636b63. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/NO26K2414020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01e51b11e2b0227ad52585193a344fd2d9b54944b2a2a211131b7422e4f76c4f. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/NO26K2414040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34dbd775fa1afe4a4e49f4ca33a4dfb0bb94d3fd43617661fee5f571caf585ca. 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/NO26K2414050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a9f00421ab6ec59b9adb6cd265a8826ef4547860d08418da071fee474a1e86a. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/NO26K2414060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1db15d0d42fb303a61428451cf99733f0d135a27afc8d1fc15e3766c4d4f3c5e. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NO26K2414110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e5c0ffad857c4c03ef92978ce4452e91d83a51b4f315a3a4bde2506385bf571. 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/NO26K2414140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4861c413a0803d9576c8c83dd10bd5e97e6adba6c78788e9a11c2bc686436ef3. 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/NO26K2414150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e7882d23fe8954b589747fbf173e3c6ee168891ab9de02dffbde19a754715ad. 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/NO26K2415020.