Spencer Ludwig (born 24 June 1990) is an American trumpeter, singer, songwriter, producer and musical director from Los Angeles, California. The former trumpet player for the band Capital Cities, he r
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 0xc5b58d9be025ac02134eb56d5c11ffbd2a2202166a964f33cc2cdcc9776e4b7e. 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/2a1a5b42-7f4e-4324-8df3-83ca85242ca7.json and https://artists.proofprofile.net/proofs/artist/2a1a5b42-7f4e-4324-8df3-83ca85242ca7.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 0x016a73736326e83688e4305ce93ba6f425de7fb4dcc8b75ce014fb801db4cdd9. 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/USWL12201599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f02a7934d8a6773426bcf6abafec6e996052176f08854b096380a863e802eb0. 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/QZQAY2451119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6309259780ef3c1310a35a014fafe80ef5a07909b5457d5ccc6d757aa4f2fd53. 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/SE6ZX2390011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48c14ae402e27811b09b1a68a3b5d93522476c13f66d27954929d1d0936f1ac0. 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/GBKPL2163829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0a642cd5bcdec5a841a5f796dc8fe4994922f8dffb9d558e8a599cd7cf27333. 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/GBKPL2168836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad359f22cc03773031b7999d014147dfe982ab45ec2c95cde5d81a8715896ef0. 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/GBKPL1831306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x586804e84d3f12e3a96eab8060aaa5c7dd1c2a8c4c150e2be640d66b697498d2. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/GBKPL2169599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b868cca32143549e12403f0bae21168da69eabadeb633738d282aba440cc3ab. 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/GBKPL1800601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9efb580afdf9a5d1fa419503c02689d8c2f93d7d69f038ed96bbe04b7f6b6212. 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/GBKPL1807318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02629ac99183a42ec4e8d0a1a8fa90cd4b979919783f2e8f88e85272a21ee46a. 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/QZTV32377022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70d30af9d6d1c91d5823660a17e175f948ce26d2b3c41d8a79b9bb9b356ee6a6. 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/QZWDE2429798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83febaacf29c668c0d7e72646e4aa10cc040bbbe491c85c85d8329de7d178a75. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/QZWDE2429804.
Summertime With U - Slowed Down + Reverb
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe7b8b083c11ffab70e3d4afa805c2f56e17ee187abd58d9c45ae9ba632cb3b. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/QZWDE2429808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02629ac99183a42ec4e8d0a1a8fa90cd4b979919783f2e8f88e85272a21ee46a. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/QZTV32377022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd6309e6df80d3e0669c1aa2fadc275878240a7adf5d3dd8a679817209d0f8f5. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QM24S2307563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12662275c0740df056e9d460ffce35b67f15087f915588f4dadab94aa095179c. 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/QZWDD2366546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3300d7202daf20218835de472fac6689b0d8f0fb09834a40afdc9325b4bbe953. 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/QZNJW2325385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6424604e33bb55707c2dcc613220a42bdc7d87a0c1a8975c087946f9f7607306. 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/QZWDD2277788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb48b9d06cccc719107159e055bd6b587fcb81ebaea79d734fc6756411c1f48fd. 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/QZTAT2103586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad359f22cc03773031b7999d014147dfe982ab45ec2c95cde5d81a8715896ef0. 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/GBKPL1831306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eb2d14b77e5463c0940caf5786976a1d6c93c1b3842411e70c4c4bb0a448935. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBKPL1826735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9efb580afdf9a5d1fa419503c02689d8c2f93d7d69f038ed96bbe04b7f6b6212. 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/GBKPL1807318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa85db3c38e3d90cca00c969a7e6168fbb7aaf4a54291746487e701f8b39d1f2. 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/USWB11701460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdde4db6164f8bec4448abb4a6038314ff046e2e80b84404fa3d800fd93b6141b. 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/GBEWA2201723.
LOUDER! (Love is Loud) (feat. Francesco Yates & Spencer Ludwig)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dc441289b61a46e57f7a5505b3003eec29f5395e97ccce5040dc4d41b5fc958. 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/USWL11600285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf002fd75fc160d640ba83022f124b5d372f1b5b802969f6beba69d64b7b8522. 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/TCADK1720473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d67a9ed1dfb0c075ec063a1f4f513983de6c4a6012c8252b35cf018207ce658. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBEWA2204546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f9870f7b76e343e1efaac1220f9656e900a180089f178afed70d824db7672ff. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/USC421500066.