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 0x9cc0b0c0ffd4f73e13115b78bfb460164f4423fd5614195854c5e1da35df9ded. 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/295869c4-2f4b-4970-a905-35f1a3be205e.json and https://artists.proofprofile.net/proofs/artist/295869c4-2f4b-4970-a905-35f1a3be205e.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 0x9f8e6f9bd8ffd9646d1feb354eed9d6a308a9bf0b9cdfcc0ceb5f4d1288578e9. 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/ITG272300405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8007748909b89068ddcd95b66b811b1cc55f69b0f320f46fd7f3e8ef58968647. 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/ITG272300406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbbdf66aa780801733940cad6c129354f34dc813824519b0249c805a6f586a78. 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/ITG272300407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x208e7dd2f82006b41b8113f14b229fab7945346bd4e537d8576f386ed7a779c3. 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/ITG272300408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe76f8cf9fcfb34a3a0c17dfab4516ab61ab34767eb8b87a4363dbe1bad9e13e6. 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/ITG272300409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00013211d1216e72c9bd837c0439d89a0274b22153032e78d33c48b9d05dfe49. 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/ITG272300410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac9a9d75ac96ba977c6d01ba1ff6f887e8dc6c3152d74586cec6e3e019ff8354. 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/ITG272300411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc218d634455f4ed0976ef5ab4b71aa5e7307708c71c95bd91bc479d51e79da16. 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/ITG272000685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x004e0a1c9e189d67d45f1ff8b027772389436bac05de7aad18dd594afafca869. 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/ITG272000686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x946c7bfcc313f464db4fe8547cccc4245125819ade4a47051b86f5b18b21a2e4. 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/ITG272000687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6892031da0f71abcf18b534feaebea0301ad0db5d27a4c89e190b7d780f22b1. 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/ITG272000688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e8787c57e69b9bb643b29af657a7f634cdfbeb3c685fe9d42ec4121c6096b73. 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/ITG272000689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x105b70f68cc019a3747b68e22d7099f0527285949eeca580a4860d7b40ceda65. 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/ITG272000690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f3634ca6292e87dc4d5dfb06d7977768e553d43406997fcf663750aca026ab. 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/ITG272000691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde97d60ccfaa618907a98cc5e9b53b015d1c4cc9a5100119c91bd4737f320768. 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/ITG272000692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04004a5d9b5764c1888cad6bd1527c1218f609ec6ca95c5990d90787afdef8c1. 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/ITG272000695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x004e0a1c9e189d67d45f1ff8b027772389436bac05de7aad18dd594afafca869. 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/ITG272000686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x946c7bfcc313f464db4fe8547cccc4245125819ade4a47051b86f5b18b21a2e4. 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/ITG272000687.
Serenade of the Netherworld (Bonus Track)