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 0xb6802a1a83e9b96fe40775f16f292935fbdd78f3ec149fc61f7b11563c89271f. Chain 2 (Bitcoin): anchored in block 953605 (2026-06-14T07:39:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0f6307ad-620e-48f4-b043-12a1692f929f.json and https://artists.proofprofile.net/proofs/artist/0f6307ad-620e-48f4-b043-12a1692f929f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
4e Betuwse Mannenzang: Niet ritmische psalmzang met Bovenstem
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 0xb4bd62608d82007ce1d87c0d951562e1080af3d5eb3f611a01f874b4d0673c4a. 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/NLG620616448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf976db07f762bf6583498e171cdb0c5470750518c1f65905dbefd76eae35c35a. 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/NLG620616450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb11fc7a61968dd5b99e3c7cb6bed4315e5ea7a47fb0282e39a8d3ec7e31302b3. 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/NLG620616453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1b7a572b26a120ee3d3711c11b049d6318341a32664c734665964b27b71f74c. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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/NLG620616455.
1ste Betuwse Mannenzan: Niet ritmische psalmzang met Bovenstem
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ecff4cd379d716eb42f559665ae529878d4e61c475f5969472d6402a99d4b7c. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/NLG620616538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcfb5acc8e785a219f806005a4b068a138b5198882afbfcd9e2bf1abcbda9f99. 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/NLG620616539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60c95e626c578d17ac233a37bc28021f0276060429f85853803f59db64312f88. 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/NLG620616542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb286a7fe057c53e80e89a070479050334e9c43351a996fcecf852cf69df62d9a. 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/NLG620616543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc61b1131dcb34f71ed4fae86006426230c26bbc00283287c3d2577428c01b6e3. 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/NLG620616546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba7636830f03e402c46500d40db5f309e3b012d4b40cffe8a986854e70415de1. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T10:05:01Z), 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/NLG620616540.
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 0xfa1cbec376c4c118d6791cdbf221319307681d23f8120f24e9d88886a62e1cf2. 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/NLG620616443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1982c23e1172a86c3c54fbba52a421ae39261296d39d756e82a24995d81bb71f. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/NLG620616444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58719ab73e64c1be2aa101294eb7d7f80998ed98d6d4a426bf3426963173e4ab. Chain 2 (Bitcoin): anchored in block 960101 (2026-07-29T11:46:30Z), 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/NLG620616445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc6362ef394c882e9a5a079495357a7ae4dbb880d1e858fedf395525e3684529. 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/NLG620616446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4251a8f5e0a360102a4b38e62ac3bcd9abbb8e54a2ad12b2f8a0086af6af7c6. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/NLG620616449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc8709e01474e63f6541ff46415fbf38803f1c330a5736f32e5985c44dee4127. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/NLG620616451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaadd84045e8654e1396652e4f2d972992a15b59a2b02fbdef2c4a13a402e2546. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/NLG620616452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32d70a36416480ffda936c5da30c449ca4735d83aa569e3ecafe73b80920fc02. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/NLG620616454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4abcc2d8576d7cdc9982d8e5ad87a0f0912b8c9bf7fa2cc1dd18ff14bd50fa08. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/NLG620616544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x394712d31a572561890baf3fa1e60879636fff5f9adcfeae264fcc543a6640ac. 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/NLG620616545.