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 0x069c9e7584de98df31f7a3be298779366e176396a332d1dccb0d97b46a6024ef. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a0757460-a47d-4112-bfbc-45465f0d9a4f.json and https://artists.proofprofile.net/proofs/artist/a0757460-a47d-4112-bfbc-45465f0d9a4f.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 0xa29d9ab211d96dd941fd6098bd9af3aca4c9c783b0a62d27d55d0f104460215c. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/USCGJ1954050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9c372e5813a40cb55b6c6410e6c64b3e4b22c0084303769081e188147c8d276. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/USCGJ1954052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3312e29132a6c4113a18011fb67a3e69bd658fd416e1c40d687216069c2d6f8b. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/USCGJ1954056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b5deead915295d8da34ebf8db36fda1190a1023e15b991d150410ff7c435374. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/USCGJ1954032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe06eba319b6f3e4d1602bc0d92d402c93e5348c3f7c53ad1f4d33285bf793c04. 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/USCGJ1954033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2afeba4dd5d2271d9994416ee53623bd84e0c9c6e4bf7eb7436c0c31c66bccf. 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/USCGJ1954038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb170832031ff4d1372530440e2540bf10c41639181d8926901a5e7e200398ff. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/USCGJ1954265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78dd56f9854fc4a558dede6074fa83326e7bcbfbdfa1d73f7fb1fa01aa29e942. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/USCGJ1954527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf841a6f2d51982e6037bac9ee535c322968b157e36fe3537611ebe9cdd943714. 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/USCGJ1954528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ccea004c1e00081e4a08b5feed49eeecd947329c271b0fda6611b4da2dd33d. 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/USCGJ1954530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23fcc21edb01d26827c1f9972e22b83e0bc3ad12162f2a4eb53c3935d11a0231. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/USCGJ1954531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x670fe79382245ea989c8ef13ac97f2b3938a519127f44764e848a84441c57bbb. 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/USCGJ1954532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec799f5db2a650706566568ab56a22aaa30fbe8ff28948e94e40f7a3a4527537. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USCGJ1954535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01077f367602ee255df47e744905bb4e4571df4ee1671b53516a782900611864. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/USCGJ2061063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e61637cbd4593289524ca83a08234f566c28abd0c6b581787e3492dac9eeb7b. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/USCGJ2061066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4c8b32badaa88b4bc97bca776d8348b94608d22c70105ad7af8b935b50b8049. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/USCGJ2061067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa613753525c2978d27404e902ac18afe0020ba5a12825567c37f57c90321d84d. 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/USL4R2022540.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6d29c31128bd7a8f579c09ebcd7d3cb1a012af9878a0a000917435b63519455. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/USDY42216941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be554894b07b353efca6c888d10f3acf2ddc222b79f09ed42941f848d640b24. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USDY42216947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe91623bfbb925ba745637770294e5625db80e752254dd00be60cb5d54383a695. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USHM22380185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d29d25808b3e6e3fbd9123c8def1bad9d50cb7b314a8923a3424a63881a5d26. 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/USHM22380186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ed8e535921e427f28376ca5dff5d5f23a90239b692ce1ba65be67c1f9819e3f. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/USHM22380188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f4703eae5d68b57d4675ecb748b6f5d19adb0f1ed2dfd196a696dbe5258e4ff. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/USHM22380189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a7d18f0e7ea495190e8226378d1c1189557876f8d5d78d6ca1d1fb451f615b. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/USHM22380191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2662380ce58e0244bb943487a42c3cea016ac1f554f00cf069c0d6e16a415de. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USL4R2492542.