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 0x8e9203468a6aa04e8fdc987fd5d5123a143688da5168e407352a77d694752f9b. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f5015a8b-718c-4254-967d-cb70726630c3.json and https://artists.proofprofile.net/proofs/artist/f5015a8b-718c-4254-967d-cb70726630c3.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 0x44e7b55032416b8c4ecf94b72a5eb36ad7c6df6f72b7fbec72bcc8d225adddcc. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZHN42015586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce95775c8c0b28d1f16dddc478ec2a94f898902a8dc0b13613617b4438893622. 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/QZK6N2018818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1cbdc31055279d2806cccd1ae0182226a9332d9e1d7e2bdd7775e663689ba60. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZK6G2090339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c66c1b0e294ff91056661a51e2a46e1b0dc165325d4bfb26c434b99cba0a12f. 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/QZHNC2110527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc506da315f622674120efb92795bf707e57b948bd6a40826fcd8254aa8abbcc2. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZHNC2110529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa20e76d595738cad6ddb0b1af0e1db048f8bf81d2f1f79a53d9291824afa49f1. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZNWU2106740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d332fba30120af8b1aaa8410857dcac9dc33e3b8d55a0e6cbc22ecb6242db9b. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZHN92359303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdae3f19b382753579c1a15f56022547853ed70188d22762ef044055ee891fe2d. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZK6N2484362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3cc025a862c63817ba50870973a810b3028c29fdbf1386d860e01a5bf910656. 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/QZWFE2485860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6858bd67285b425486fc6db3c3c6af0cb88fc8530a07ca2b34cbc7f6cf1d866d. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZMER2538040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdae3f19b382753579c1a15f56022547853ed70188d22762ef044055ee891fe2d. 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/QZK6N2484362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6ade7631c7cd13896fdab9a5d2b47fe476e4707fe614a0d95dd614f78afb2ce. 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/QZMER2538042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe82e5430eab5136e60cde430113459e0345936c0fc147535e71ad65b01495dd6. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ762430045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61b1996bb16f0b37281204f850e61ff80a9c5ae0d00d27308f40712ddfd581e4. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZDA62528571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceba6350f35d291e788fd121d81a80cf1dc4f9dfab32f00a42959e8fd6b5bcb5. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZMER2538045.