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 0xa3c188fa3061f64d5b58581569b97cd7463fa79062eb84ab210864133b3f251b. 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/4a157b0a-fa84-4f8b-98fc-8a31ea0c0b5c.json and https://artists.proofprofile.net/proofs/artist/4a157b0a-fa84-4f8b-98fc-8a31ea0c0b5c.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 0x399037b0d3ed38154476688cb8ee5049be6f19f9b4181f9175eaddbabccbcfd2. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CAUM82400038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8022b8df6a101504ed4d6a7c9b17e2c3ced5d72ad0bcd31b62f358ea2a83b6b. 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/QZMHP2056235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0546e59e328f31335feb8066fefc8fc48d5838f2cd08872292f251da6bd3ef30. 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/QZWDD2275798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdd1f54cc1759c7d326cf042a3eef12b4b6f6722caae1205e066433b05d67831. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZWDD2275816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd4a50b78317f6d3f776a4b6c4a0adc2da0c2b8acc6af41c7e76b49a34a4466f. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/QZWDD2275822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10acb37496a525797d5349754fd7f651397a99f1f7f52a185a40aa1c2af71020. 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/QZWDD2275823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe13ba1efedb27a1ebb42eb279518db093f00c5a4cef3016bb6f513b586052a67. 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/QZWDD2275824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2256aaf2fa506fa51196c51212866e0918be1d5e96f4bff29a5f2cd82d44c509. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/QZWDD2275825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab4f9b0d347129f867bb8540ceefc8e54491711d477dd7685bf3fa2b20f188f6. 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/QZWDD2275829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5760f921d039845ca8c6ddfb19c23cfc71dcdf38710cf38826975d8f5b60bef. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/QZWDD2275831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf676d290287243244c163179c31e7630583bdb67306548c3e11ef9f1fa4af26a. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/QZWDD2275837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32e222588792c36f286ff57b9942892092daa832d7967f6b67e48457a33e0ad9. 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/QM24S2405018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeec9126139c5cbe2382b798dc57536e3905523156cc5f5797e68a5196be80413. 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/QM24S2405017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0362b4833d61c06a39ef627a20f41240da73ad3228b4f07f067523f17825f00. 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/QM24S2404558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe792d7410944eaa6d4e544b8ba8088928af1e14c99b8aff121edf3b8ae9a605d. 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/QM24S2405016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc569ca99ca8be4ac1b539d9c65a09a8cd2b828d24b5727d87c506169b501a76. 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/QM24S2405015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e9f806726a5ab814a4c08731cf8732fbc9fa3f5ff407dc1559e6afae74ccac2. 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/QM24S2405014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb1fd5b8594f648fd5b69f6bf2f03f5418b41db440df032ff08c419786657ba4. 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/QMDA72159400.