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 0x509c1069335a5fe0fec5efabc3decc37c2bb42279736fdc5952992fa470113fb. 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/c789b01c-6a44-4dfa-8a7e-1ef92a5422d2.json and https://artists.proofprofile.net/proofs/artist/c789b01c-6a44-4dfa-8a7e-1ef92a5422d2.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 0x1526f41b32a59554e084b8b58c168b80c969528239dca13362798a0b64a90d38. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/DEKB72043890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa74537563c3beccc2ed4d0cc9819c2d754ebd6a301db8fa6ff37461147236868. 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/NLCK41072242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b99066e3ec2d3c585e25291a0590461b2e605cfd50b6f83fea3df88e597cee3. 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/NLCK41086214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73a769b02290ab6d7528251bdcd6ea701a91fea048b141a2215893ca03a0af21. 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/NLCK41086215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ffa7c1a698e6d67f72361671b2da2e5385861bf1cb0ffeeab63adc95a8482a7. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/DEKB72067489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c412320cfddf36a50a9d325f222407525668e911862d00694f67d8fb5e8c276. 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/NLCK42214221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bbc5178e1be240a9a1854c315b98b8d9fcd216fbe3950fe34ae52c3f1ba134a. 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/NLCK42214222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5decbd4a463ec41bc7b43e820e07d05b69003ec32d1bc0a88cc11a26081892b5. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/NLCK42216385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25be9f576ef5dc3c138f77c30119890730dd34f951a0e47c92a92a876437d4ae. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/GBTMZ2301189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb0173949ea83518cbf3c78cb97b572d2c27ea7c1c5228ade25af711c71172de. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/NLCK42400691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fe641e9344495566606943e9383594ec493f9a351c013f024bbfa433e7e58d9. 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/NLRD52355147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa74537563c3beccc2ed4d0cc9819c2d754ebd6a301db8fa6ff37461147236868. 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/NLCK41072242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfca37f71760d54dbae0e0309161781b646bf0f49f1822dba6462208e887f808. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NLCK41099846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaceddf471c4b15c6ef85cc40fda8bc79f6bc968a502f44d63d702f1215e2fbf5. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/NLUW22201830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a26af3bea953d4d62c02afbf30bf82943883d38de871e4d87395ecf7c9f1a7. 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/NLCK41062202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb0173949ea83518cbf3c78cb97b572d2c27ea7c1c5228ade25af711c71172de. 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/NLCK42400691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bffa516d8328e20f6c3f48359c61cf561fee4f9cab0297ea88dc51c4d982e10. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/NLCK42235672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5decbd4a463ec41bc7b43e820e07d05b69003ec32d1bc0a88cc11a26081892b5. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/NLCK42216385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bffa516d8328e20f6c3f48359c61cf561fee4f9cab0297ea88dc51c4d982e10. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/NLCK42235672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fe641e9344495566606943e9383594ec493f9a351c013f024bbfa433e7e58d9. 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/NLRD52355147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaceddf471c4b15c6ef85cc40fda8bc79f6bc968a502f44d63d702f1215e2fbf5. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLUW22201830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a1b8471817e4a7e6e1c24275c2a70f97f2fcf1255ebfb6272c76999b826c1c7. 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/NLCK42227375.