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 0xa8303935b65b1102681d1d62a021b7409af11a4d6f408a33ac5f567cb00c6c20. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ca20240f-5f35-4cf0-a31a-bca9ea9dbeb0.json and https://artists.proofprofile.net/proofs/artist/ca20240f-5f35-4cf0-a31a-bca9ea9dbeb0.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 0x2b35666070c51bb72c6e1c702a9200040ad2d2c32acac865046466e3127ee05a. 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/QZYFZ2373187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf622a886e28f244c074dfc66db24bb37e30656958e70dc0bdc5437c0c649ea0d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZWDW2371349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3542a4971bd20431d1b8139361816da990a85c5d96fc8ce7c0489c6dbf9244f4. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZYFZ2428004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd701fad78934d4b59bb0562555e4072b8d913c0ae0e39f3493808687d91301b7. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZYFZ2348259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55b9fcc15e6fdd91995974b340fec4741b8ad893a69deaad2d00b2997b4d2ccf. 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/QZYFZ2442364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5621d558d4017224f387894fbe20556cc67d0c2d03adddf7fbb1304cea8b1b19. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZYFZ2414462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe149c58f1642ff180eaeec9285296cc1491f1a858d6e58f170c3fc5d5c60fbfb. 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/QZYFZ2442365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7be9f7444c8f62a553ffe157adb2d5434bcd9bd81a7804fb197d87aa89a0d3dc. 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/QZYFZ2442367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a9bdeea09be5ac5f8e58a9042dbcaafd19e0984c6cad62d9f84aaddd4fbde7b. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZYFZ2442368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56c9c2375e12d17f974ea4564d445916bf0b3047602881df50e0335e53a88bd7. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZK6L2429814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cf6b23db69e3a13677d53f34b0629f5f4ea87972fdc55a37c50a059f06597d1. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:33:43Z), 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/QZYFZ2442366.
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 0x56f8e01aa388cf6ad5be799ae544e21380b2378ef8423b9ec0e8f80725b9267b. 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/QZK6P2419192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x905e69c0ffe8f0c31e5f8dcac5c29aea9a4db4a0a5f8897b4a78d259c803a5b4. 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/QZWDW2358899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f61c6a8ac26406bea1c1aa063694508df4915527bacb1dc7a5a976a3bf31483. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZWDW2358897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e46d99cab9d3de7e6ebc554fa35db31611a868122cf7093a95870e38c551a4. 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/QZYFZ2303140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61b879944bdde28ee33c8798c4a3afbaeb6bdcc5279f48abe5444dd7d6003c7a. 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/QZN882298391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d36f0aadf1cca767ac7d562516652d2c8faebbebfd9026ae63504404749184d. 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/QZWDW2211443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa85c1d17ce78a1d3d8d42391783e4626151fdf423c9735a0aae2c479e90e5c81. 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/QZWDW2442644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcabc444c9f3f02438ce489018e8213297e95ac7b2c696f50244264a442aeb05c. 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/QZWDW2442645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aa61305d4128a88921198a7cae83dd726c961800ddc8acd22b441744cd82b02. 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/QZWDW2442646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a8fe229d65be665adcfc3eb0a0ee5fbfc1dabf2fd605c4d02c9e35be5f02a4. 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/QZWDW2442647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c21cd821044200657b8a8173548f7c3be2383a1744bd0addc2493ef10fecc3b. 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/QZWDW2224086.