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 0x59bb2e533002a0125a60dbf04f144f9e4e6700cff02ad70a4185dcaf6b6a26a6. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/77d7f5b7-dc08-43e9-809f-c7bf5ff7a6d3.json and https://artists.proofprofile.net/proofs/artist/77d7f5b7-dc08-43e9-809f-c7bf5ff7a6d3.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 0x4286e112578512a89dec4b0ee1dcd2823d44ea0f938f74da1e9dea8d0e39fdc0. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/MX2832506215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08a40ee305cc9b7f5e2f4a91b401b3f38cb9f487d49cc8eaa43179db4ff80649. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/MX2832506216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee87ec61bd8e397a13c7efc0dc90323a3475c9068351b8e81bd707e27aeb6eb. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/MX2832506217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e708a55a3ebe4aad6a91279f8ff004315ae31655df393e6a6300208f9b0ad8f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/MX2832506218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60d059aa88cc29739c5380c287ef17c39e5be7e1321021056df7abaee9788969. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/MX2832506219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03b40610b917245b2c182d0632314ceff76738a37ad58fa9054b290979aaa85e. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/MX2832506220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e3cc59ce435a1f205f42c6a29670b4763845526ca5b60037c42f4a4264670ed. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/MX2832506221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46501233605ff540e681265e4022674247c648731a6cf724976d7b12c3c1f0da. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/MX2832506222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8495e5d88eaa06a03caa24150a8905b89bec750e3b44e2e2f0d789b4c0804da. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/MX2832547838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab10625700dc468fa8dee23bc8df3593ede31520ab1ecee0bc4c0e0fc57f128e. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/MX2832547839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x718c2049399147b0fdc155ea133872e51091cf553e1a48640cff3cc62bb4f02d. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/MX2832547841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc58a421301bc3e7b0eb2baaead031e50feef7a95edaf609fcf3fad2ba8716ed2. 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/MX2832547840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef0d0bdea0f65cf780bbe6b6c5ede01a4222463055e89e29e8081360d1916a4b. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/MX2832547842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0727bcca4c2f7910c14e3f7f33a31474dc7a85ef5ef15638dc0f884111f8586a. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/MX2832547843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f078b0b7f2badbad1565b689b97b2e4350f59ac76c3c9bf001ffa98f94a310e. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/MX2832547844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ec089beb22b52784c6168b8a1a4122668c56753560852dfe4381091fec7d766. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/MX2832547845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a1880a262d8f5e20631aa35b7a81c1e40435864df36fab3846874649ab3df5d. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/MX2832547846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e6b5d199a7a31fcdf76e2a36e5944e68b2c8bb1f9b2f6a8d4a265e4c4e12624. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/MX2832547847.