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 0xae41abc073e6de40d03580e004e48941d2c1b5f10c351d01e1106c8c78d889e1. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5ed42fa4-2617-4c18-a597-c3d9354afbe7.json and https://artists.proofprofile.net/proofs/artist/5ed42fa4-2617-4c18-a597-c3d9354afbe7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Fine knacks for ladies : No. 12, Fine Knacks for Ladies
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 0x6d156605eea91d37f46b3d5486d5fb19955fc6edd279f898d6929398cb8f2c7b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEBAA1205701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a7ad6f69db2ea73c0ac748e53c923b9f843bb33dc43de4ad2cb90973ee61a2b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEBAA1205702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x047af8a95fa80e36084dddb64edf10337ca21821ed58d03d29f6a74457fdffac. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEBAA1205704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e2468647b725bbf8e136ca3ea16374235386fbbbfb8a3000d328c14205621b8. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEBAA1205705.
Musicke of Sundrie Kindes: Faire, sweet, cruell: Faire, Sweet, Cruell
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b2e13aa9c5a4275f87458374475d307188bcd6330a49c20c0604183044bc322. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEBAA1205706.
Booke of Ayres, Book 3: Shall I Come, Sweet Love, to Thee?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d59e6e20f717ab70d863695e7960824ee2dea449a32b1b9000dae463091397b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEBAA1205707.
Dear, if you change, I'll never choose again: No. 7, Dear, If You Change
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76512b012cb1a78a63badb3f91546b5f974ee4a7782a73384b0a6df5b21c0cbb. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEBAA1205708.
Come again, sweet love doth now invite: No. 17, Come Again, Sweet Love Doth Now Invite
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9ea8eb065a8a6335f356f971e034299a4d8fe2867f2aac9accfd9a1eac6a1db. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEBAA1205709.
Flow not so fast ye fountains: No. 2, Flow Not So Fast Ye Fountains
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb230f5951a2998a967d3b8489516ff45a50e96d6adc6a4488aa3f76a811d6e6c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEBAA1205710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfba3b3bdbed30d1b7eff37a9c1384967f9889f4de41494d87d73b31a53cb6b48. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEBAA1205713.
Why dost thou turn away?: Why Dost Thou Turn Away?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8239fc1c788668a9af35ed6bd11318245aada2e8a48685d90734bb7641362859. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEBAA1205715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c62994988e441df3eb763366fd3181d67d6786d50a19664e4cf5ec8ee19fad1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEBAA1205716.
Birgit Nilsson's Greatest Songs and Arias
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13c2277383f051e2b3bbd46debd8afeb1ec9279b0f84111ebcff35dab1d7737c. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/SEWDL9210813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a76cc4db39a5d403a5a3d8b6cd0e310b48275b1c8cf86a76554af9d98d18914. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/SEBAA1206107.