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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bf363941b4e9077ff478288117061391259eccb94308ecab4485903a40b8e5b. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/be5e828a-c5e9-476f-a376-2aa267ba4b6a.json and https://artists.proofprofile.net/proofs/artist/be5e828a-c5e9-476f-a376-2aa267ba4b6a.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x446adfd9f0fa2d1b7267a354f3671ef4239f3675e6a9071a19f106c72ccf577d. Chain 2 (Bitcoin): anchored in block 958196 (2026-07-15T22:36:32Z), 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/QZPLR2371610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c1976f7008c0d11179cd282b4b0597d70052f0257648191950fd24016897af2. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZPLR2371611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cc917e3ecb95d9b4db567c2bb04e196a36375878611c398b27204dbf4046544. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZDA62437950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35125c2461a4cf55d7e12ac03494cbada7f1f72ec7cae8b230816fe3c0fd299f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QT3EX2456150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31b651a1b3f7371d4d3ead1c1d098349e3c4541dc0eec469dea33d73e4facb65. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZFZ32586433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50bbcb8e53922d9e3d3b4dd941c6c4abcc3512974e104c2ac77aed8d4d753c71. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T18:25:49Z), 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/QZFZ32586436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba7849a37468c4f6f35974b20f06f4d0ad013ecf4a062844ee494114c7aca78. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZFZ32586439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x035dac709a944839e3fbd448c5e915656eac2de197a79fe7c4a5233deaef2338. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZFZ32586441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56fee8d2f861d7a44bc3a73d14ccff2fec919ed05f124f98e08ff1307185cd73. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZHN32556134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf45c4b9180a9cf58c99742c058fd38a42bc899c9f65c3b704d0bc9b8ec63692f. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/QZHN72566120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75b79eb69b7d8cce4f4b99a0e3f6db3ea6795837b868f31b58abd8d5e2ba5df5. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZK6G2535582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33606acdb90f41c78836cdeaef12e8b42cbca491ae4a3c3a7636a4028e83ea0b. Chain 2 (Bitcoin): anchored in block 956748 (2026-07-05T05:55:59Z), 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/QZK6G2535583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9079d4eb5dfc35944de1aee59a01e175cd35ff1cf4b3b05c95e4447afb190ab. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZK6G2535584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdf3cef3d4930524db88c99fdbccc4493cb9e86b3ddb76bd8ffbf0199f231afe. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZK6G2535586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15e5121687c40d262c01df84cd4a6ab991ec175672553e7be98cedfa52220b7b. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTB72539533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d3bf150bea21efbde3a1ceeb2d68956a55f7d37732ffef17700f6820697ee80. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QT3EY2433783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4088464ceb6a14b4d8c3e16e2d2bfa592c09f5f496920aeb9cdab17f477c2d91. 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/QZES62540165.
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