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 0xb4c30a237ff1a5e15d6193351471f03be372efd64d722c5c1711b8e212f7082d. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a2b7d5b3-63fe-44e9-b87b-bb1426eb21de.json and https://artists.proofprofile.net/proofs/artist/a2b7d5b3-63fe-44e9-b87b-bb1426eb21de.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 0x24f6a5d379d2eb1cf73fbc0311c6f24570dcd1ac5e88bdbb7c9dd7cfb2563608. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T05:29:27Z), 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/TCAIA2440226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed9449cc665d332e6f6f463e986085b5ecccd519c2212df2498eb9a73d6e1cb7. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/TCAIA2440234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad5519dc1a5107ceac43a0da9dae7b65037962a94426512272d2a370691e03c3. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T15:38:02Z), 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/TCAIA2440237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8c4ef16672888150f1d6111398c407aa72b735fc42993d752f92fb4d8265634. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-22T02:27:36Z), 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/TCAIA2440241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d38aca121657a3162c9108697863fdb6364c87670a1ee0db6797a82f78a4d33. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T15:25:47Z), 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/TCAIA2440249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ebea9a7601ddb33d7b26dc06aa1e85a04c70536fd45df0f2e770484440a03c8. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/TCAIA2440252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09e02db0342fbb41ed19e4e9dd79dffb63935866c8d9a3d4085fbbd9696c01d0. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/TCAIA2440282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x650f53c104a1345fc20e21c0a9c6a3c1faf5e7bfa1755c8391b7679983f68aab. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T11:01:08Z), 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/TCAIA2449440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e89dc0c6838e92401f0e75080fe3ebcb4feaf650dbfa0a742c1210450b89dc7. 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/TCAIA2449450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ec1bd64c41145c25bc005aba62f5cd76f2caf93b3bf83efda611a2a3e05aa2a. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T18:39:07Z), 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/TCAIA2449455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35edae46218ac67c34e4d29d6008944b5ee4bba7edd2720ea41f3294da2ed62d. 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/TCAIA2449459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf040194eeac42f14de445e400e2bbb7612637000749d8c7c3d5ce05dc8655d12. 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/TCAIA2449465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e6009a42c73fe2331b57ae788ab17fe92aa5ccff156c5704250bc0a80e574be. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/TCAIA2460881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d7b89cc677739cd5ccda322371d4bdf06cae15a7c28eb9b5c5695af551204e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCAIA2460884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaf83d63827264145b4a7bfeeb1011ee09f539263c485add26e7ae5ac2d5cbac. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/TCAIA2460888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a8c89230baed9af2dbe086cb6cf0d5fd9bb02a232570c315b9e0fe47a549580. 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/TCAIA2460890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22c76dfc6ee8d1d65c580dfd9f2885211030d0e701c1e37d0311a3ed449ff307. 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/TCAIA2460895.
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