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 0x2faee64d5c39cdf6fe039df0243401ff8725796ecd797ac9b8d080f55df8f9b3. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fabb5fe5-3e32-4e43-a302-1a963479fa88.json and https://artists.proofprofile.net/proofs/artist/fabb5fe5-3e32-4e43-a302-1a963479fa88.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 0x2e115e3a17c4c97e029831a631382ff6ad24e40aa140eb86aa482a4db313f504. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/USJ3V1159262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bf26104e84cbc3190acb303cc271cf0ddfb8bc69d44d067fab207836d7b0d01. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USJ3V1159264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75dcabb8c0197e30dcbed78b1bb4b391960be3a44e935f4a9dba88b186713c74. 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/USJ3V1159266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95350c5c73d1760ffd2acffff862a7aca8c976595d08c15c986efaad0a2bfad3. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QM9SX2101238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69b870f6dc91a0dfc4e7037f4b2fd64c48493acfb64e391a2ae16bf98938b085. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QM9SX2101247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b082c9c90d59409893b4d93d49fb99d328ea0ad1d51b3d7e064d32a03dfa7fd. 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/VNA0F1713240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74da30092be442e04f4c0b2d38b95c663d4dde884a0e7de5b70aa004bea21160. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QM9SX2101350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x249e11796b271f595d5effc9e37fccd2602f808789e01d39f2174c6866ab924b. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T23:08:07Z), 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/VNA0F1766697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8518ae2af563de846811721788a2121b4333b6def94af43400f78cd6b92b3f27. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/QM9SX2202534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x814223efaa9c320e082212beea92c5f6653c8a9409bb7e43b6f4f3955485d11b. 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/QM9SX2202535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe20dc00b6499a9b4cfe490241a9943e29461a8e9859cff2d30b314a731db668f. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:37:46Z), 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/QM9SX2202541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e9555b109aebd9a7c5a3ded4c5a6a9ed87a840f44fd9d594b08b60aea0d550b. 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/QZGCD1800549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e8d0c250de98e57b80ee954ef92bda9cf0b182f6713f6bfd3039cbfa42fbe82. 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/QZGCD1801499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e7ca3f46dfb3129501771ab57eb3b03e6e2629a02931b5444bafb129343210b. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZGCD1801706.
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