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 0x4c0dba3e3567ed9270951d92f891f1a7074bfd23c1d5d26440efa36a6ef05b57. Chain 2 (Bitcoin): anchored in block 953773 (2026-06-15T10:40:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ca702b32-dc6d-4575-a7d0-f138de6d7c92.json and https://artists.proofprofile.net/proofs/artist/ca702b32-dc6d-4575-a7d0-f138de6d7c92.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 0x784fd7e10a364b79b745b5851838ae793d6beccaa952a484dc53730bf9410553. 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/QZ4JJ1918029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26ca0a23b7bad0cb5a85b10e8c25efd30c048289d4ddeb31565d3aa304e5a123. 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/QZES91809269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c22ed4aa3970640b49d01848f43c55c259a4b33e9b901de3b07e5e2a4b8f5d7. 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/SE5751887021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa36c048851cc84b933b8087195ae5cf5eac8d5958b3cd7ed72cec8d118b90e6d. 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/MXF170811504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4af086e0ac1c851f5c1abe4527936e1a91ff74d094ce10cd823b5ee04d61d5aa. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/MXF170811510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe866083a3747df280aae51dd004259a01cf5926b676428f33c6644d9995b17fa. 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/MXF170811514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0880dcdf945bbc632dd966d3d7183bc44a807e9a81a11fdfd832d03fd9f5c6a3. 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/MXF170811517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde4345b1ec6919d66da961782e00c1325e3ad959988340ec97e792c2565664df. 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/FR2X41750203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x866026cbad0c227b5f7cefe38de34b9dbb4089f4f912d7c37edc434a5350d660. 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/QZMEN2405953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd77eb6e7be85864034d64bb7dfd99e2ed7a0b43f3a02a8cc2162d60b4267776a. 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/QZNWY2349957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x938a9f3cc81a1808ec6c4b53dbf9fac3d44f4ee262a276685f4600722a92b0a5. 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/QZK6P2389322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3064a44a50382fd69d0a622c8af753668675f43ea4303e00da71360276f5a1f1. 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/QZDA81933180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe49c5d498e75fca8efaed115f11a3a3b964f095f6e66be8e54f898719887d49b. 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/QZHNC2115544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabbd921a0f3c283b188bc51b93a42a2d4b2ceb0f54ea991f325fc00a8ba103d4. 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/QZFZ42165772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc565f821e5f7625ca3fbd7181716d3081194a62d01475f4254829fe10db71a27. 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/QZMEP2002878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda2e9c223a0ea4bdc55347f7e7970d940c91f529c297cafa97d7e4194e93596d. 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/NLS6R1861074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47a728dc4dfc96a4e99957a52def2f9d1234f47ccd8c915ce37bf74af6aafa1a. 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/QZNWX2016866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x493acaf1c851df3c517836e307c0fc0dd6b332d460c08f224f09f7218083b056. 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/SE5751835746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bd20f334d592ecf2a03f8122124656923d9edcf514b7a7ed3e4f935935ce53d. 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/QZDA52275444.